The main cause is in the log:
14:21:53.183 [i]: Avisynth: 2.5.8.6, AvisynthMT 2.5, C:\WINDOWS\SysWOW64\avisynth.dll
14:21:53.183 [E]: VideoPlayer: Avisynth 2.5 isn't supported
...
14:22:25.016 [i]: Playback [10c62]: Frame server (64-bit) 0.1.0.0, AviSynth+ 0.1 (r2506, MT, x86_64), C:\WINDOWS\SYSTEM32\avisynth.dll
So you need to copy avisynth.dll file from SVP 4\plugins64\ folder to your potplayer folder or to folder C:\WINDOWS\SYSTEM32
It will replace avisynth to version compatible to SVP.
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If you are using 32-bit version of potplayer then you need to copy avisynth.dll file from SVP 4\plugins\ folder to your potplayer folder or to folder C:\WINDOWS\SysWOW64