Used this the other week with no problems. Now the world loads and crashes immediately after creation a second after you start to be placed in the world.

Version: OpenTerrainGenerator-1.12.2 - v6.jar
MC: 1.12.2
Forge: 14.23.5.2814

[17:54:23] [Server thread/ERROR] [net.minecraft.server.MinecraftServer]: Encountered an unexpected exception
net.minecraft.util.ReportedException: Exception ticking world
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:762) ~[MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:668) ~[MinecraftServer.class:?]
at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:185) ~[chd.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_144]
Caused by: java.lang.NullPointerException
at com.pg85.otg.customobjects.bo3.BlockCheck.rotate(BlockCheck.java:56) ~[BlockCheck.class:?]
at com.pg85.otg.customobjects.bo3.BO3Config.rotateBlocksAndChecks(BO3Config.java:1358) ~[BO3Config.class:?]
at com.pg85.otg.customobjects.bo3.BO3Config.(BO3Config.java:860) ~[BO3Config.class:?]
at com.pg85.otg.customobjects.bo3.BO3.onEnable(BO3.java:1151) ~[BO3.class:?]
at com.pg85.otg.customobjects.CustomObjectCollection.loadObject(CustomObjectCollection.java:62) ~[CustomObjectCollection.class:?]
at com.pg85.otg.customobjects.CustomObjectCollection.getObjectByName(CustomObjectCollection.java:207) ~[CustomObjectCollection.class:?]
at com.pg85.otg.generator.resource.TreeGen.getTrees(TreeGen.java:30) ~[TreeGen.class:?]
at com.pg85.otg.generator.resource.TreeGen.spawnInChunk(TreeGen.java:143) ~[TreeGen.class:?]
at com.pg85.otg.generator.resource.Resource.process(Resource.java:152) ~[Resource.class:?]
at com.pg85.otg.generator.ObjectSpawner.processResourcesPhase3(ObjectSpawner.java:502) ~[ObjectSpawner.class:?]
at com.pg85.otg.generator.ObjectSpawner.populate(ObjectSpawner.java:178) ~[ObjectSpawner.class:?]
at com.pg85.otg.forge.generator.OTGChunkGenerator.populate(OTGChunkGenerator.java:203) ~[OTGChunkGenerator.class:?]
at net.minecraft.world.chunk.Chunk.populate(Chunk.java:1019) ~[axw.class:?]
at net.minecraft.world.chunk.Chunk.populate(Chunk.java:980) ~[axw.class:?]
at net.minecraft.world.gen.ChunkProviderServer.provideChunk(ChunkProviderServer.java:157) ~[on.class:?]
at net.minecraft.server.management.PlayerChunkMapEntry.providePlayerChunk(PlayerChunkMapEntry.java:126) ~[ot.class:?]
at net.minecraft.server.management.PlayerChunkMap.tick(SourceFile:147) ~[ou.class:?]
at net.minecraft.world.WorldServer.tick(WorldServer.java:227) ~[oo.class:?]
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:756) ~[MinecraftServer.class:?]
... 4 more
[17:54:23] [Server thread/ERROR] [net.minecraft.server.MinecraftServer]: This crash report has been saved to: C:\SSD Games\MultiMC\instances\Paradigm Server Pack.minecraft\crash-reports\crash-2019-05-05_17.54.23-server.txt
[17:54:23] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Stopping server
[17:54:23] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Saving players
[17:54:23] [Netty Local Client IO #0/INFO] [EnderCore]: Reset configs to client values for com.enderio.core.common.config.ConfigHandler
[17:54:23] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Saving worlds
[17:54:23] [Server thread/INFO] [net.minecraft.server.MinecraftServer]: Saving chunks for level 'OTGWorld'/overworld
[17:54:23] [Netty Local Client IO #0/INFO] [waterstrainer]: Importing waterstrainer_loottables.cfg ...
[17:54:23] [Netty Local Client IO #0/INFO] [waterstrainer]: No errors were found!
[17:54:23] [Client thread/INFO] [journeymap]: Mapping halted in C:\SSD Games\MultiMC\instances\Paradigm Server Pack.minecraft\journeymap\data\sp\OTGWorld\DIM0
[17:54:23] [Server thread/INFO] [OTG]: Saving structure data
[17:54:23] [Server thread/INFO] [OTG]: SaveToDisk waiting on Populate. Although other mods could be causing this and there may not be any problem, this can potentially cause an endless loop!

Hey, thanks for reporting. Looks like a problem with BO3's, some files may have been edited or corrupted. If you're using a pre-made pack, could you try copying over the WorldObjects directory with a new one?

Should definitely add better logging for this and prevent a crash.

*Looks like a problem with BO3's spawned as trees btw