Hi,

I have had this error when trying to open a world I created on another minecraft installation, could someone help? Here is the whole crash report:

---- Minecraft Crash Report ----

WARNING: coremods are present:
IELoadingPlugin (ImmersiveEngineering-core-0.12-98.jar)
Contact their authors BEFORE contacting forge

// Uh... Did I do that?

Time: 1/15/21 2:28 PM
Description: Exception ticking world

java.lang.NullPointerException: Exception ticking world
at cam72cam.immersiverailroading.tile.TileRail.save(TileRail.java:107)
at cam72cam.mod.block.tile.TileEntity.save(TileEntity.java:375)
at cam72cam.mod.block.tile.TileEntity.func_189515_b(TileEntity.java:112)
at cam72cam.mod.block.tile.TileEntity.func_189517_E_(TileEntity.java:138)
at net.minecraft.network.play.server.SPacketChunkData.(SourceFile:52)
at net.minecraft.server.management.PlayerChunkMapEntry.func_187272_b(PlayerChunkMapEntry.java:157)
at net.minecraft.server.management.PlayerChunkMap.func_72693_b(SourceFile:165)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:227)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:756)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Server thread
Stacktrace:
at cam72cam.immersiverailroading.tile.TileRail.save(TileRail.java:107)
at cam72cam.mod.block.tile.TileEntity.save(TileEntity.java:375)
at cam72cam.mod.block.tile.TileEntity.func_189515_b(TileEntity.java:112)
at cam72cam.mod.block.tile.TileEntity.func_189517_E_(TileEntity.java:138)
at net.minecraft.network.play.server.SPacketChunkData.(SourceFile:52)
at net.minecraft.server.management.PlayerChunkMapEntry.func_187272_b(PlayerChunkMapEntry.java:157)
at net.minecraft.server.management.PlayerChunkMap.func_72693_b(SourceFile:165)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:227)

-- Affected level --
Details:
Level name: Henry
All players: 1 total; [EntityPlayerMP['HP361'/260, l='Henry', x=-1257.43, y=73.62, z=854.29]]
Chunk stats: ServerChunkCache: 966 Drop: 253
Level seed: 1621597456123477036
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (-840,73,858), Chunk: (at 8,4,10 in -53,53; contains blocks -848,0,848 to -833,255,863), Region: (-2,1; contains chunks -64,32 to -33,63, blocks -1024,0,512 to -513,255,1023)
Level time: 1729948 game time, 5181 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 1 (now: false), thunder time: 1 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:756)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Thread.java:745)

-- 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: 612701544 bytes (584 MB) / 1275068416 bytes (1216 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: 12, tallocated: 94
FML: MCP 9.42 Powered by Forge 14.23.5.2847 8 mods loaded, 8 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 | trackapi             | 1.1          | TrackAPI-1.1_1.12.jar                 | None      |
| LCHIJA | immersiverailroading | 1.7.3        | ImmersiveRailroading-1.7.3_1.12.2.jar | None      |
| LCHIJA | universalmodcore     | 1.0.0        | ImmersiveRailroading-1.7.3_1.12.2.jar | None      |
| LCHIJA | immersiveengineering | 0.12-98      | ImmersiveEngineering-0.12-98.jar      | None      |

Loaded coremods (and transformers): 

IELoadingPlugin (ImmersiveEngineering-core-0.12-98.jar)
blusunrize.immersiveengineering.common.asm.IEClassTransformer
GL info: ERROR RuntimeException: No OpenGL context found in the current thread.
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [EntityPlayerMP['HP361'/260, l='Henry', x=-1257.43, y=73.62, z=854.29]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

TIA

1. That crash looks like it's caused by Immersive Railroading, which is not the same as Immersive Engineering.
2. 1.12 is not longer supported here (even if it was an IE issue).
3. For future reports please put the crashlog on https://gist.github.com or https://pastebin.com (or a similar site).