I can't open Witcher 3 because i always get this error :

Error [mod0000_mergedfiles]game\player\playerinput.ws(313): syntax error, unexpected TOKEN_IF, expecting TOKEN_FUNCTION, near 'if'

What should I do to fix it, because there is not Mergeable errors to fix in Script Merger...

Thanks a lot!

This is a question you should be asking the mod (and/or mod merger) author/s.