Error ....... was not created

[Selur]

Can i provide something to better understand why vapoursynth is not detected by Hybrid ?

If you start Hybrid through the command line, it should report where it tries to find Vapoursynth (vsViewer and other tools too).
If your Vapoursynth or the Vapoursynth scripts Hybrid uses (see: https://github.com/Selur/VapoursynthScriptsInHybrid/) are not hinted through a misc.ini and can't be detected Vapoursynth will not be supported. ( see: [INFO] *hidden* Hybrid options,...)

Cu Selur