Aeriona

Ok, thank you.

Hello, I've never used this forum site before, and I know little to nothing about code. This morning I downloaded some mods that required Llibrary, which i promptly downloaded. It worked for a while, but whenever I try to open a save the game crashes and displays this message: The game crashed whilst exception in server tick loop Error: java.lang.NoSuchMethodError: net.minecraft.entity.EntityLiving$SpawnPlacementType.canSpawnAt(Lnet/minecraft/world/World;Lnet/minecraft/util/math/BlockPos;)Z And here's the detailed crash report: java.lang.NoSuchMethodError: net.minecraft.entity.EntityLiving$SpawnPlacementType.canSpawnAt(Lnet/minecraft/world/World;Lnet/minecraft/util/math/BlockPos;)Z at net.minecraft.world.WorldEntitySpawner.func_180267_a(WorldEntitySpawner.java:226) at net.minecraft.world.WorldEntitySpawner.func_77191_a(WorldEntitySpawner.java:282) at net.minecraft.world.gen.ChunkGeneratorOverworld.func_185931_b(ChunkGeneratorOverworld.java:466) at net.minecraft.world.chunk.Chunk.func_186034_a(Chunk.java:1019) at net.minecraft.world.chunk.Chunk.func_186030_a(Chunk.java:999) at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:157) at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:344) at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:173) at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:196) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486) at java.lang.Thread.run(Thread.java:745) A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- System Details -- Details: Minecraft Version: 1.12.2 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_51, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 467778192 bytes (446 MB) / 872415232 bytes (832 MB) up to 2147483648 bytes (2048 MB) JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95 FML: MCP 9.42 Powered by Forge 14.23.5.2847 Optifine OptiFine_1.12.2_HD_U_C6 5 mods loaded, 5 mods active States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored | State | ID | Version | Source | Signature | |:------ |:--------- |:------------ |:------------------------------------ |:--------- | | LCHIJA | minecraft | 1.12.2 | minecraft.jar | None | | LCHIJA | mcp | 9.42 | minecraft.jar | None | | LCHIJA | FML | 8.0.99.99 | forge-1.12.2-14.23.5.2847.jar | None | | LCHIJA | forge | 14.23.5.2847 | forge-1.12.2-14.23.5.2847.jar | None | | LCHIJA | cfm | 6.3.1 | MrCrayfishs-Furniture-Mod-1.12.2.jar | None | Loaded coremods (and transformers): GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread. Profiler Position: N/A (disabled) Player Count: 0 / 8; [] Type: Integrated Server (map_client.txt) Is Modded: Definitely; Client brand changed to 'fml,forge' What does it mean? How to I fix this? It may have something to do with OptiFine, which I downloaded just before it broke.