I am also having this issue:
22:23:32.946 [E]: Playback [5f36749]: VS - Script evaluation failed:
22:23:32.946 [E]: Playback [5f36749]: VS - Python exception: SVSuper: invalid 'params' syntax: * Line 1, Column 2
22:23:32.946 [E]: Playback [5f36749]: VS - Missing '}' or object member name
22:23:32.946 [E]: Playback [5f36749]: VS - Traceback (most recent call last):
22:23:32.946 [E]: Playback [5f36749]: VS - File 'src/cython/vapoursynth.pyx', line 2244, in vapoursynth.vpy_evaluateScript
22:23:32.946 [E]: Playback [5f36749]: VS - File 'src/cython/vapoursynth.pyx', line 2245, in vapoursynth.vpy_evaluateScript
22:23:32.946 [E]: Playback [5f36749]: VS - File '/home/$USER/.local/share/SVP4/scripts/5f36749.py', line 56, in <module>
22:23:32.946 [E]: Playback [5f36749]: VS - smooth = interpolate(clip)
22:23:44.998 [E]: Playback [5f36749]: VS - File '/home/$USER/.local/share/SVP4/scripts/5f36749.py', line 37, in interpolate
22:23:44.998 [E]: Playback [5f36749]: VS - super = core.svp1.Super(input_m8,super_params)
22:23:44.998 [E]: Playback [5f36749]: VS - File 'src/cython/vapoursynth.pyx', line 2069, in vapoursynth.Function.__call__
22:23:44.998 [E]: Playback [5f36749]: VS - vapoursynth.Error: SVSuper: invalid 'params' syntax: * Line 1, Column 2
22:23:44.998 [E]: Playback [5f36749]: VS - Missing '}' or object member name
22:23:44.998 [E]: Playback [5f36749]: VS - could not init VS
Very strange... I'm using mpv-full, so I guess I just have to mess with alternative packages or something?