Sometimes we found some mods that have mixin cannot load with Liteloader.
org.spongepowered.asm.mixin.transformer.InvalidMixinException: Unsupported mixin class version 52. Mixin requires compatibility level JAVA_8 or above.
That was caused Liteloader's mixin is really outdated(The 1.8.9 one is 0.5, and the 1.12.2 one is 0.7)
If you met that, please make sure:
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Liteloader was only put in mods folder, NOT installed as a library.
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Make sure there's a mod loads mixins before Liteloader like !mixinbooter-7.1.jar.
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Replace outdated MixinBootStrap to other mixin loaders if ur game crashed. Might also try Mixin 0.7-0.8 Compatibility if you have multiple mods with mixins.
PS: this WON'T fix mixin conflicts like CCBlueX/LiquidBounce#733 ask mod author if u meet failed to launch like this.