Redmine

Hello guys,

I am trying to make a plugin work on a docker container.
The plugin was download from internet ; is a bit dated and is called 'redmine_all_thumbnails'.

I have found some info on the web that made me make a few modifications, but the result that I have attached is still giving me
the following error :
/usr/src/redmine/plugins/redmine_all_thumbnails/lib/redmine_all_thumbnails/hooks/layout_base_hook.rb:23:in '<module:RedmineAllThumbnails>': uninitialized constant RedmineAllThumbnails::Redmine (NameError)

Is there anyone that can give a hand ?

Thanks in advance,
Dominic