Have a good trip 
And one thing previously I didn't noticed but lately finds out:
If you set "auto" but not "force" to QTGMC vaporsynth, the error message will not appears.
Message only appears when "force" option was enabled.

And one thing previously I didn't noticed but lately finds out:
If you set "auto" but not "force" to QTGMC vaporsynth, the error message will not appears.
Message only appears when "force" option was enabled.