That doesn't look like BetterFps failing, more like Chiseled Me. Hard to say whether MultiMC is involved.
Some patches were not applied to class TileEntityBeacon:
transformer 'beaconBaseColor':
method func_146003_y()V:
- <replace GETSTATIC net/minecraft/item/EnumDyeColor.WHITE Lnet/minecraft/item/EnumDyeColor;>
at dev.necauqua.mods.cm.asm.dsl.ASM.checkMisses(ASM.java:182) ~[chiseled-me-1.12.2-2.0.0.1.jar:?]
at dev.necauqua.mods.cm.asm.dsl.ASM.doTransform(ASM.java:129) ~[chiseled-me-1.12.2-2.0.0.1.jar:?]
at dev.necauqua.mods.cm.asm.Plugin.transform(Plugin.java:40) ~[chiseled-me-1.12.2-2.0.0.1.jar:?][/pre]
...
Have you tried with the default launcher for comparison?
Okay, I did a little further investigation, and it's a conflict between Chiseled Me and BetterFps - they both modify TileEntityBeacon, so currently you can only use one or the other, and it's a known issue: https://github.com/necauqua/chiseled-me/issues/48
I keep getting a crash when using betterfps on multimc. Click here for the log.
That doesn't look like BetterFps failing, more like Chiseled Me. Hard to say whether MultiMC is involved.
Have you tried with the default launcher for comparison?
I've tried it on Twitch and anytime I add betterFps it just crashes.
Okay, I did a little further investigation, and it's a conflict between Chiseled Me and BetterFps - they both modify TileEntityBeacon, so currently you can only use one or the other, and it's a known issue: https://github.com/necauqua/chiseled-me/issues/48
Welp. Thats a shame but thanks for the help!