Thread:Extension talk:Validator/Fatal error: Validator depends on the ParamProcessor library/reply (7)

Hello. I'm using 1.20.x and I have shell access but sorry, I can't find the information about how to install ParamProcessor with or without Composer...

Also, after using composer I had to recover from a backup because this error. (That was an attempt to update Maps to 3.0, for use with Semantic Maps).

Please, some guide to solve this?

Thanks.