Plugin doesn't work in latest (13.2) OpenProject version

[Sinneida]

I cannot launch proto plugin in latest version of OP - 13.2

I followed the instruction as stated in README, OP docs and so on.

Plugin is loaded when checked on Administration page, also Rails console shows seeded entries when querying database for kittens.

I've encountered following errors:

• apparently hook for sidebar changes and I cannot see kittens in the sidebar

= also when trying to reach endpoint kittens in the browser, following error pops up:

I'm not familiarized with OP development & plugins, so if there are any logs I can provide to help, please state which one.