Note the backtrace - it’s trying to run /usr/local/bin/wpscan - this is a file that is not installed by us, nor do we have any way of tracing down what is incorrect for it.

You need to remove your locally installed version and try again.

I completely removed the gem wpscan and the one from apt-get i also autoremoved and autocleaned.
I installed wpscan from apt-get and when i run it im faced with this error

root@Server01:/# wpscan
/var/lib/gems/2.5.0/gems/activesupport-4.2.1/lib/active_support/core_ext/numeric/conversions.rb:121: warning: constant ::Fixnum is deprecated
/var/lib/gems/2.5.0/gems/activesupport-4.2.1/lib/active_support/core_ext/numeric/conversions.rb:121: warning: constant ::Bignum is deprecated
Traceback (most recent call last):
4456: from /usr/bin/wpscan:23:in <main>' 4455: from /usr/bin/wpscan:23:inload'
4454: from /usr/share/rubygems-integration/all/gems/wpscan-3.4.0/bin/wpscan:3:in <top (required)>' 4453: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:inrequire'
4452: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in require' 4451: from /usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan.rb:6:in<top (required)>'
4450: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:in require' 4449: from /usr/lib/ruby/2.5.0/rubygems/core_ext/kernel_require.rb:59:inrequire'
... 4444 levels...
4: from /var/lib/gems/2.5.0/gems/activesupport-4.2.1/lib/active_support/core_ext/numeric/conversions.rb:131:in block (2 levels) in <class:Numeric>' 3: from /var/lib/gems/2.5.0/gems/activesupport-4.2.1/lib/active_support/core_ext/numeric/conversions.rb:131:inblock (2 levels) in <class:Numeric>'
2: from /var/lib/gems/2.5.0/gems/activesupport-4.2.1/lib/active_support/core_ext/numeric/conversions.rb:131:in block (2 levels) in <class:Numeric>' 1: from /var/lib/gems/2.5.0/gems/activesupport-4.2.1/lib/active_support/core_ext/numeric/conversions.rb:131:inblock (2 levels) in <class:Numeric>'
/var/lib/gems/2.5.0/gems/activesupport-4.2.1/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in <class:Numeric>': stack level too deep (SystemStackError)

Ive checked the /usr/bin directory and wpscan doesnt exist in there.. so now i am confused.

Can you move /var/lib/gems/2.5.0/gems out of the way?

On my system, /var/lib/gems/2.5.0 is empty, and wpscan works fine. It sounds like there are still other gems around that are getting in the way and taking precedence over the Kali installed ones.

root@builder:~# dpkg -L wpscan
/.
/usr
/usr/bin
/usr/bin/wpscan
/usr/share
/usr/share/doc
/usr/share/doc/wpscan
/usr/share/doc/wpscan/README.md.gz
/usr/share/doc/wpscan/changelog.Debian.gz
/usr/share/doc/wpscan/copyright
/usr/share/rubygems-integration
/usr/share/rubygems-integration/all
/usr/share/rubygems-integration/all/gems
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/app.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/controllers
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/controllers/aliases.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/controllers/core.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/controllers/custom_directories.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/controllers/enumeration
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/controllers/enumeration/cli_options.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/controllers/enumeration/enum_methods.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/controllers/enumeration.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/controllers/main_theme.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/controllers/password_attack.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/controllers/wp_version.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/controllers.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/config_backups
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/config_backups/known_filenames.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/config_backups.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/db_exports
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/db_exports/known_locations.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/db_exports.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/interesting_findings
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/interesting_findings/backup_db.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/interesting_findings/debug_log.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/interesting_findings/duplicator_installer_log.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/interesting_findings/emergency_pwd_reset_script.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/interesting_findings/full_path_disclosure.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/interesting_findings/mu_plugins.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/interesting_findings/multisite.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/interesting_findings/readme.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/interesting_findings/registration.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/interesting_findings/tmm_db_migrate.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/interesting_findings/upload_directory_listing.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/interesting_findings/upload_sql_dump.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/interesting_findings.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/main_theme
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/main_theme/css_style.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/main_theme/urls_in_homepage.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/main_theme/woo_framework_meta_generator.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/main_theme.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/medias
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/medias/attachment_brute_forcing.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/medias.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/passwords
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/passwords/wp_login.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/passwords/xml_rpc.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/passwords/xml_rpc_multicall.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/passwords.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/plugin_version
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/plugin_version/readme.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/plugin_version.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/plugins
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/plugins/body_pattern.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/plugins/comment.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/plugins/config_parser.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/plugins/header_pattern.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/plugins/javascript_var.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/plugins/known_locations.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/plugins/query_parameter.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/plugins/urls_in_homepage.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/plugins/xpath.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/plugins.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/theme_version
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/theme_version/style.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/theme_version/woo_framework_meta_generator.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/theme_version.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/themes
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/themes/known_locations.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/themes/urls_in_homepage.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/themes.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/timthumb_version
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/timthumb_version/bad_request.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/timthumb_version.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/timthumbs
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/timthumbs/known_locations.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/timthumbs.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/users
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/users/author_id_brute_forcing.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/users/author_posts.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/users/login_error_messages.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/users/oembed_api.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/users/rss_generator.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/users/wp_json_api.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/users/yoast_seo_author_sitemap.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/users.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/wp_items
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/wp_items/urls_in_homepage.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/wp_items.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/wp_version
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/wp_version/atom_generator.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/wp_version/rdf_generator.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/wp_version/readme.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/wp_version/rss_generator.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/wp_version/unique_fingerprinting.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders/wp_version.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/finders.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/models
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/models/config_backup.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/models/db_export.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/models/interesting_finding.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/models/media.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/models/plugin.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/models/theme.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/models/timthumb.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/models/wp_item.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/models/wp_version.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/models/xml_rpc.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/models.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/core
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/core/banner.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/core/db_update_finished.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/core/db_update_started.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/core/not_fully_configured.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/core/version.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/enumeration
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/enumeration/config_backups.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/enumeration/db_exports.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/enumeration/medias.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/enumeration/plugins.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/enumeration/themes.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/enumeration/timthumbs.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/enumeration/users.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/finding.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/info.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/main_theme
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/main_theme/theme.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/notice.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/password_attack
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/password_attack/users.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/theme.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/usage.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/vulnerability.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/wp_item.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/wp_version
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/cli/wp_version/version.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/core
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/core/banner.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/core/db_update_finished.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/core/db_update_started.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/core/not_fully_configured.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/core/version.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/enumeration
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/enumeration/config_backups.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/enumeration/db_exports.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/enumeration/medias.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/enumeration/plugins.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/enumeration/themes.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/enumeration/timthumbs.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/enumeration/users.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/finding.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/main_theme
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/main_theme/theme.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/password_attack
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/password_attack/users.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/theme.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/wp_item.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/wp_version
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/app/views/json/wp_version/version.erb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/bin
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/bin/wpscan
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/browser.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/controller.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/controllers.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db/dynamic_finders
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db/dynamic_finders/base.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db/dynamic_finders/plugin.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db/dynamic_finders/theme.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db/dynamic_finders/wordpress.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db/fingerprints.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db/plugin.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db/plugins.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db/theme.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db/themes.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db/updater.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db/wp_item.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db/wp_items.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db/wp_version.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/db.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/errors
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/errors/http.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/errors/update.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/errors/wordpress.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/errors.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder/finder.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder/version
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder/version/body_pattern.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder/version/comment.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder/version/config_parser.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder/version/finder.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder/version/header_pattern.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder/version/javascript_var.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder/version/query_parameter.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder/version/xpath.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder/wp_item_version.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder/wp_items
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder/wp_items/finder.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/dynamic_finder/wp_version.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/finder
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/finder/wp_version
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders/finder/wp_version/smart_url_checker.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/finders.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/helper.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/references.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/target
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/target/platform
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/target/platform/wordpress
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/target/platform/wordpress/custom_directories.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/target/platform/wordpress.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/target.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/version.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/vulnerability.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan/vulnerable.rb
/usr/share/rubygems-integration/all/gems/wpscan-3.4.0/lib/wpscan.rb
/usr/share/rubygems-integration/all/specifications
/usr/share/rubygems-integration/all/specifications/wpscan-3.4.0.gemspec

root@builder:~# ls -lah /var/lib/gems/2.5.0/
total 8.0K
drwxr-xr-x 2 root root 4.0K Mar 4 2018 .
drwxr-xr-x 4 root root 4.0K Mar 19 2018 ..
root@builder:~#

Hi Steev,

Renamed /var/lib/gems/2.5.0/gems to /var/lib/gems/2.5.0/gems.old

WPScan instantly started working!!!!!

Thank you for the suggestion, was pulling my hair out over this.

Thanks again.

This was not a Kali bug.