youtube plugin error: "error-cz/vity/freerapid/plugins/services/youtube/youtubeRunner"

i checked plugins and version update, everything is up to date
i don't know when exactly i got this problem, it always worked fine, i think, until i updated plugins
i 'm a daily user for freerapid for downloading youtube videos, and i haven't ever got this error.

Please attach app.log (Help -> Browse to log file).

sounds like there is even a problem creating log file, here is log file:

Wed Mar 23 00:57:08 EET 2016 WARNING: Couldn't create fir C:\Users\Mina\AppData\Roaming\VitySoft\FRD

Trigger the error, then attach app.log. And please provide example link.

now it works!!
just closed the program, now i occasionally opened it, and it works fine !
sounds weird, i've been using it a long ago, nothing like this happened before !
thanks