[14:16:33] [main/WARN] [mixin]: Error loading class: net/minecraft/client/renderer/tileentity/TileEntityRendererDispatcher (net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerException: Exception in class transformer net.minecraftforge.fml.common.asm.transformers.SideTransformer@22d1886d from coremod FMLCorePlugin)
[14:16:33] [main/WARN] [mixin]: @Mixin target net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher was not found mixins.laggoggles.json:MixinTileEntityRendererDispatcher
[14:16:33] [main/WARN] [mixin]: Error loading class: net/minecraft/client/renderer/entity/RenderManager (net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerException: Exception in class transformer net.minecraftforge.fml.common.asm.transformers.SideTransformer@22d1886d from coremod FMLCorePlugin)
[14:16:33] [main/WARN] [mixin]: @Mixin target net.minecraft.client.renderer.entity.RenderManager was not found mixins.laggoggles.json:MixinRenderManager
[14:16:34] [main/WARN] [mixin]: Error loading class: net/minecraftforge/common/util/Constants$BlockFlags (java.lang.ClassNotFoundException: The specified class 'net.minecraftforge.common.util.Constants$BlockFlags' was not found)
Какие-то coremod'ы конфликтуют. Ищи проблемный мод.