Internal error when i try to save a wiki page about redmine-google-chat HOT 1 OPEN

I unchecked the choice to warn about editing a wiki page.

I no longer have the error message on the wiki. :( .... :/ .... :)

However, I do not get anything on slack, whether the options are enabled or not. I use here a virtual machine under Debian Stable + RVM to test the plugin on Redmine 4.0.2 stable

Resolving dependencies...
Using rake 12.3.2
Using concurrent-ruby 1.1.5
Using i18n 0.7.0
Using minitest 5.11.3
Using thread_safe 0.3.6
Using tzinfo 1.2.5
Using activesupport 5.2.2.1
Using builder 3.2.3
Using erubi 1.8.0
Using mini_portile2 2.4.0
Using nokogiri 1.10.2
Using rails-dom-testing 2.0.3
Using crass 1.0.4
Using loofah 2.2.3
Using rails-html-sanitizer 1.0.4
Using actionview 5.2.2.1
Using rack 2.0.6
Using rack-test 1.1.0
Using actionpack 5.2.2.1
Using nio4r 2.3.1
Using websocket-extensions 0.1.3
Using websocket-driver 0.7.0
Using actioncable 5.2.2.1
Using globalid 0.4.2
Using activejob 5.2.2.1
Using mini_mime 1.0.1
Using mail 2.7.1
Using actionmailer 5.2.2.1
Using method_source 0.9.2
Using thor 0.20.3
Using railties 5.2.2.1
Using actionpack-xml_parser 2.0.1
Using activemodel 5.2.2.1
Using arel 9.0.0
Using activerecord 5.2.2.1
Using mimemagic 0.3.3
Using marcel 0.3.3
Using activestorage 5.2.2.1
Using public_suffix 3.0.3
Using addressable 2.6.0
Using bundler 1.16.6
Using css_parser 1.7.0
Using csv 3.0.5
Using htmlentities 4.3.4
Fetching httpclient 2.8.3
Installing httpclient 2.8.3
Using mysql2 0.5.2
Using net-ldap 0.16.1
Using ruby-openid 2.3.0
Using rack-openid 1.4.2
Using sprockets 3.7.2
Using sprockets-rails 3.2.1
Using rails 5.2.2.1
Using rbpdf-font 1.19.1
Using rbpdf 1.19.8
Using redcarpet 3.4.0
Using request_store 1.0.5
Using rmagick 2.16.0
Using roadie 3.4.0
Using roadie-rails 1.3.0
Using rouge 3.3.0
Bundle complete! 28 Gemfile dependencies, 60 gems now installed.
Gems in the groups development, test and develop,test,postgresql,sqlite were not installed.
Use bundle info [gemname] to see where a bundled gem is installed.
redmine@vps:~/redmine-4.0-stable$ gem install httpclient
Successfully installed httpclient-2.8.3
Parsing documentation for httpclient-2.8.3
Installing ri documentation for httpclient-2.8.3
Done installing documentation for httpclient after 2 seconds
1 gem installed

https://wiki.visionduweb.fr/index.php?title=Installer_Redmine_sur_Debian_avec_RVM

https://wiki.visionduweb.fr/index.php?title=Installer_Redmine_sur_Debian#redmine-hangouts-chat

from redmine-google-chat.