When I create a singleplayer world my game crashes. I load the game back up and the world is there but when I try to join my game just crashes again. Here is the crash report if it helps.
---- Minecraft Crash Report ----
WARNING: coremods are present:
XaeroMinimapPlugin (Xaeros_Minimap_20.19.0_Forge_1.12.jar)
Contact their authors BEFORE contacting forge
// I let you down. Sorry :(
Time: 8/9/20 9:36 PM
Description: Exception in server tick loop
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:
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-- 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: 995008184 bytes (948 MB) / 2013265920 bytes (1920 MB) up to 3221225472 bytes (3072 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G -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 14.23.5.2816 Optifine OptiFine_1.12.2_HD_U_C6 7 mods loaded, 7 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-1.12.2-14.23.5.2816.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCHIJA | forge | 14.23.5.2816 | forge-1.12.2-14.23.5.2816.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCHIJA | xaerominimap_core | 1.12.2-1.0 | minecraft.jar | None |
| LCHIJA | thedalekmod | (Update 58.1.0) | Dalek Mod - Update 58.1.jar | None |
| LCHIJA | xaerominimap | 20.19.0 | Xaeros_Minimap_20.19.0_Forge_1.12.jar | None |
Loaded coremods (and transformers):
XaeroMinimapPlugin (Xaeros_Minimap_20.19.0_Forge_1.12.jar)
xaero.common.core.transformer.ChunkTransformer
xaero.common.core.transformer.NetHandlerPlayClientTransformer
xaero.common.core.transformer.EntityPlayerTransformer
xaero.common.core.transformer.AbstractClientPlayerTransformer
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'
Maybe a coremod problem.
Update forge to the latest 1.12.2 version
If that doesn't work, try removing mods such as optifine or xaero or updating those mods too.