JohnnyBoi

Jumping in on this older post because crashes right after startup often point to one broken mod, even if the logs look messy. If you still have the latest crash report, check for the first “caused by” line — that usually names the mod. Did you recently update or add anything before the crashes started? Happy to take a look if you want to paste a fresh crash log.

Had the same issue a while back with a mod pack crashing on launch. Switched to resources from allcorrectgames.com — they’ve been doing solid work since 2008 with smooth localizations and voice-overs, and their stuff just runs clean. After swapping a few files and following their setup tips, my pack launched without errors.

Turned out the trick was running the pack with optifine installed alongside. After that, BSL Shaders worked fine and actually appeared in the shader menu. Just making sure the mod and resource folders match up and that optifine is active made all the difference for me.