Describe the bug
GameCrash due to a unsupported file name in the resourcepack...

To Reproduce
Just copy the code you have at the bottom and try to run it with your mod...

Expected behavior
That the games doesnt crash

Screenshots
If applicable, add screenshots to help explain your problem.

System (please complete the following information):

• Occultism Version: occultism-1.19-1.36.2.jar
• OS: [e.g. Windows] Windows
• Minecraft Version: 1.19
• Modpack Link and Version, or list of mods: IC2Classic, This mod

Additional context
Crashlog:

Caused by: net.minecraft.ResourceLocationException: Non [a-z0-9/._-] character in path of location: occultism:textures/About Isabella.txt
	at net.minecraft.resources.ResourceLocation.<init>(ResourceLocation.java:37) ~[client-1.19-20220607.102129-srg.jar%23155!/:?] {re:classloading,re:mixin}
	at net.minecraft.resources.ResourceLocation.<init>(ResourceLocation.java:46) ~[client-1.19-20220607.102129-srg.jar%23155!/:?] {re:classloading,re:mixin}
	at net.minecraftforge.resource.PathResourcePack.lambda$getResources$1(PathResourcePack.java:116) ~[forge-1.19-41.0.62-universal.jar%23160!/:?] {re:classloading}

Code that was causing the crash inside your mod:

for(Map.Entry<ResourceLocation, Resource> entry : manager.listResources("textures", T -> T.getPath().endsWith("texture_package.json")).entrySet())
{
}

How to fix:

• 1: Remove said file.
• 2: get the filename into a resourcepack friendly format.

Very interesting that it's reading that file .. it's an info file from a resourcepack that has become part of occultism.
While the license requires "About Isabella.txt" to be included I'd say renaming it to about_isabella.txt should not harm