i added bewitchment to a pack of 191 mods that i use privately, until today i could not figure out why it would crash upon start up, after removing all the mods and adding one at a time in a test environment i found out that this mod BetterPortals was the culperit, the crash tells me that it is looking for mixin 0.8 but instead can only find 0.7.11 thus telling me that this mod is using the older mixin version, the crash log for this is down below, hope this helps you out, will follow the project and await an update to mixin 0.8.

https://pastebin.com/a4GL9AVC

I will probably no longer be updating this mod, see #499 (comment) for a workaround.

Try using this mixin 0-7-0-8 compatibility.