When you see this error, it isn't telling you the game is dead; it’s telling you that you are trying to access the "Golden Era" of modding without the right key.
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At its core, this error is a . Here is exactly what it means: When you see this error, it isn't telling
If the error persists, your shaders patch might be the bottleneck: If you share with third parties, their policies apply
If you want, tell me whether this error appears on launch, when joining a server, or after installing a mod and I’ll give the exact commands/files to check.