Board Thread:Support Requests - Getting Technical/@comment-28712089-20170714105039/@comment-27958705-20170714122724

argument_wrapper calls cfg.aliases to find value. there is no alias for "PPrefix" nor "PPPrefix".

Aliases here: Module:Citation/CS1/Configuration. You must fill alias table with appropriate values, like ['PPrefix']='value'. Do not ask me "what values", i don't know. I'd suggest to read module documentation.