Finally got something from which someone could understand something and maybe solve this. Firstly I am used to always go straight with sudo gainroot in terminal. the script /opt...etc. did not work in root but as a normal user which I now triied. So it gave this in terminal and I will look for the text file next.

/opt/cutetube2/bin/cutetube2 -v 5 > /home/user/MyDocs/yt-output.txt
Unsupported date format character at 1 (%-d.%-m.)
QNetworkReplyImpl::_q_startOperation was called more than once
Object::connect: No such slot YouTubePlaybackDialog:nStreamChanged()