From what I gather, this crash is due to an issue with Quilt’s Fabric API implementation.
When does the crash happen? It seems to be trying to use a class from LuckPerms mod. Are you trying to use something related to that?
I do not have the LuckPerms mod installed and never even heard of that mod, and the crash occurs when loading into a world, presumably when loading the chunks, I use nothing of the sorts for permissions.
Try installing the mod and if that works maybe report it to the developer of OPAC, because they are using a LuckPerms class unconditionally it seems.
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