[SOLVED]file is not opened

[TLE]

Hi!
Been using qbittorrent a long time now on Linux (Slackware) without any problem
but know the program doesn't start anymore
trying from terminal and I get this:

QtLockedFile::lock(): file is not opened

Tried to google but without any result relevant to this

[SOLVED]
I deleted some files in /tmp/qtsingleapp-********-lockfile