Question [Q] Link2sd mount script error-Invalid argument.

So after selecting my sd card's 2nd partition
in link2sd, I get "mount script error - invalid argument".I am not sure if thats the problem but I think this started happening after purchasing Foldermount Pro (which requires to save a txt file).Firstly this problem appeared only after rebooting the phone and could fix it by creating new partitions in sd. But now link2sd gets always this error. So what is happening?

Thanks, for more info just ask me