Error#0 assertion error! Main Thread

There are a few different posts regarding this on the forum. It seems that Avast antivirus may have a hand in some of this. If the usual DirectX 11 - uninstall Nahimic/A-Volute workarounds don’t work you may need to uninstall Avast if you have it.

Use the Avast uninstall tool for the job:

Windows Defender should take over immediately.