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I have been playing my modded minecraft with Forge 1.12.2 for a few days now, but out of nowhere my game's repeatedly crashing. It worked just fine until now and I haven't added ANY new mods before the crash. Minecraft ITSELF loads fine to the main menu, but when I go to open a saved game/server, it crashes after the "building world" point. I have 5 GB of ram and at least 100 FPs on MC, so I doubt it's a lag issue. Please help!

To start, here is the error I get when Minecraft closes

The game crashed whilst exception in server tick loop
The game crashed whilst exception in server tick loop
Error: java.lang.IllegalArgumentException: Cannot get property PropertyEnum{name=variant, clazz=class biomesoplenty.common.block.BlockBOPGrass$BOPGrassType, values=[spectral_moss, overgrown_stone, loamy, sandy, silty, origin, overgrown_netherrack, daisy, mycelial_netherrack]} as it does not exist in BlockStateContainer{block=minecraft:sand, properties=[variant]}

And here is the crash report itself.

---- Minecraft Crash Report -------- Minecraft Crash Report ----
WARNING: coremods are present: CXLibraryCore (CXLibrary-1.12.1.jar) CreativePatchingLoader (CreativeCore-1.12.2.jar) ForgelinPlugin (Shadowfacts-Forgelin-1.12.2.jar) LoadingPlugin (Quark-Mod-1.12.1.jar) ComfortsLoadingPlugin (Comforts-Mod-1.12.2.jar)Contact their authors BEFORE contacting forge
// You're mean.
Time: 10/1/18 5:04 PMDescription: Exception in server tick loop
java.lang.IllegalArgumentException: Cannot get property PropertyEnum{name=variant, clazz=class biomesoplenty.common.block.BlockBOPGrass$BOPGrassType, values=[spectral_moss, overgrown_stone, loamy, sandy, silty, origin, overgrown_netherrack, daisy, mycelial_netherrack]} as it does not exist in BlockStateContainer{block=minecraft:sand, properties=[variant]} at net.minecraft.block.state.BlockStateContainer$StateImplementation.func_177229_b(BlockStateContainer.java:209) at biomesoplenty.common.block.BlockBOPGrass.func_149688_o(BlockBOPGrass.java:140) at xxrexraptorxx.additionalstructures.world.WorldGenCustomStructures.canReplace(WorldGenCustomStructures.java:495) at xxrexraptorxx.additionalstructures.world.WorldGenCustomStructures.canSpawnHere(WorldGenCustomStructures.java:502) at xxrexraptorxx.additionalstructures.world.WorldGenCustomStructures.generateStructure(WorldGenCustomStructures.java:317) at xxrexraptorxx.additionalstructures.world.WorldGenCustomStructures.generate(WorldGenCustomStructures.java:152) at net.minecraftforge.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:167) at net.minecraft.world.chunk.Chunk.func_186034_a(Chunk.java:1018) at net.minecraft.world.chunk.Chunk.func_186030_a(Chunk.java:997) 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:186) at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:209) 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 7 (amd64) version 6.1 Java Version: 1.8.0_51, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 3118412600 bytes (2973 MB) / 5368709120 bytes (5120 MB) up to 5368709120 bytes (5120 MB) JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx5G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M -Xmn86M IntCache: cache: 1, tcache: 1, allocated: 3, tallocated: 106 FML: MCP 9.42 Powered by Forge 14.23.4.2705 Optifine OptiFine_1.12.2_HD_U_D2 76 mods loaded, 76 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 | |:------- |:-------------------- |:----------------- |:--------------------------------------------------- |:---------------------------------------- | | UCHIJAA | minecraft | 1.12.2 | minecraft.jar | None | | UCHIJAA | mcp | 9.42 | minecraft.jar | None | | UCHIJAA | FML | 8.0.99.99 | forge-1.12.2-14.23.4.2705.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 | | UCHIJAA | forge | 14.23.4.2705 | forge-1.12.2-14.23.4.2705.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 | | UCHIJAA | creativecoredummy | 1.0.0 | minecraft.jar | None | | UCHIJAA | additionalstructures | 1.3.0 | Additional-Structures-Mod-1.12.2.jar | None | | UCHIJAA | infinitylib | 1.12.2-1.12.0 | InfinityLib-1.12.2.jar | None | | UCHIJAA | agricraft | 2.12.0-1.12.0-a0 | AgriCraft-Mod-1.12.2.jar | None | | UCHIJAA | ambientsounds | 2.0.0 | AmbientSounds v2.0.8 mc1.12.jar | None | | UCHIJAA | aquaculture | 1.6.1 | Aquaculture-Mod-1.12.2.jar | None | | UCHIJAA | quark | r1.3-110 | Quark-Mod-1.12.1.jar | None | | UCHIJAA | autoreglib | 1.3-15 | AutoRegLib-1.12.jar | None | | UCHIJAA | betteranimals | 1.2 | Better-Animal-Models-Mod-1.12.2.jar | None | | UCHIJAA | betterunderground | 1.1.2 | Better-Underground-Mod-1.12.2.jar | None | | UCHIJAA | bibliocraft | 2.4.5 | BiblioCraft-Mod-1.12.2.jar | None | | UCHIJAA | biomesoplenty | 7.0.1.2361 | Biomes-O-Plenty-Mod-1.12.2.jar | None | | UCHIJAA | birdsfoods | 2.5 [1.12] | Birds-Foods-Mod-1.12.jar | None | | UCHIJAA | birdsnests | 2.0.0 | Birds-Nests-Mod-1.12.2.jar | None | | UCHIJAA | chameleon | 1.12-4.1.3 | Chameleon-Library-1.12.jar | None | | UCHIJAA | codechickenlib | 3.1.6.339 | CodeChickenLib-1.12.2.jar | f1850c39b2516232a2108a7bd84d1cb5df93b261 | | UCHIJAA | comforts | 0.0.7 | Comforts-Mod-1.12.2.jar | None | | UCHIJAA | extendedrenderer | v1.0 | CoroUtil-1.12.1.jar | None | | UCHIJAA | coroutil | 1.12.1-1.2.11 | CoroUtil-1.12.1.jar | None | | UCHIJAA | configmod | v1.0 | CoroUtil-1.12.1.jar | None | | UCHIJAA | creativecore | 1.7.4 | CreativeCore-1.12.2.jar | None | | UCHIJAA | culinaryconstruct | 1.1.0 | Culinary-Construct-Mod-1.12.2.jar | None | | UCHIJAA | customspawner | 3.11.3 | Custom-Mob-Spawner-Mod-1.12.2.jar | None | | UCHIJAA | customnpcs | 1.12 | Custom-NPCs-Mod-1.12.2.jar | None | | UCHIJAA | cxlibrary | 1.6.1 | CXLibrary-1.12.1.jar | None | | UCHIJAA | ptrmodellib | 1.0.0 | Decocraft-2.5.5_1.12.2.jar | None | | UCHIJAA | props | 2.5.5 | Decocraft-2.5.5_1.12.2.jar | None | | UCHIJAA | dynamictrees | 1.12.2-0.7.6 | Dynamic-Trees-Mod-1.12.2.jar | None | | UCHIJAA | dynamictreesbop | 1.0.0 | Dynamic-Trees-Biomes-O-Plenty-Compat-Mod-1.12.2.jar | None | | UCHIJAA | earthstones1122beta | 1.0.0 | Earth-Stones-Mod-1.12.2.jar | None | | UCHIJAA | ediblebugs | 1.6.0.2512 | Edible-Bugs-Mod-1.12.2.jar | None | | UCHIJAA | exoticbirds | 1.0 | Exotic-Birds-Mod-1.12.2.jar | None | | UCHIJAA | familiarfauna | 1.0.3 | Familiar-Fauna-Mod-1.12.2.jar | None | | UCHIJAA | giacomos_fishing_net | 1.6 | Fishing-Net-Mod-1.12.2.jar | None | | UCHIJAA | flora | 1.0 | Flora-and-Fauna-Mod-1.12.2.jar | None | | UCHIJAA | gardenstuff | 1.12-2.1.0 | Garden-Stuff-Mod-1.12.jar | None | | UCHIJAA | gravestone | 1.0.12 | Gravestone-Mod-1.12.jar | None | | UCHIJAA | gravestone-extended | 1.1.0 | Gravestone-Extended-Mod-1.12.2.jar | None | | UCHIJAA | harvestcraft | 1.12.2o | HarvestCraft-Mod-1.12.2.jar | None | | UCHIJAA | hatchery | 2.0.0 | Hatchery-Mod-1.12.2.jar | None | | UCHIJAA | ironchest | 1.12.2-7.0.40.824 | Iron-Chests-Mod-1.12.2.jar | None | | UCHIJAA | jei | 4.9.1.168 | jei_1.12.2-4.9.1.168.jar | None | | UCHIJAA | journeymap | 1.12.2-5.5.2 | JourneyMap-Mod-1.12.2-Unlimited.jar | None | | UCHIJAA | lucky | 7.5.0 | Lucky-Block-Mod-1.12.zip | None | | UCHIJAA | mist | alpha_b_04 | Misty-World-Mod-1.12.1.jar | None | | UCHIJAA | mocreatures | 12.0.3 | Mo-Creatures-Mod-1.12.2.jar | None | | UCHIJAA | morelayers | 1.2.1 | More-Layers-Mod-1.12.2.jar | None | | UCHIJAA | cfm | 5.1.0 | MrCrayfishs-Furniture-Mod-1.12.2.jar | None | | UCHIJAA | naturescompass | 1.5.0 | Natures-Compass-Mod-1.12.jar | None | | UCHIJAA | nei | 2.4.1 | Not-Enough-Items-1.12.2-Recommended.jar | f1850c39b2516232a2108a7bd84d1cb5df93b261 | | UCHIJAA | notenoughroofs | 0.6.1.0 | Not-Enough-Roofs-Mod-1.12.2.jar | None | | UCHIJAA | openablewindows | 0.0.1 | Openable-Windows-Mod-1.12.2.jar | None | | UCHIJAA | powerinventory | 2.3.1 | Overpowered-Inventory-Mod-1.12.1.jar | None | | UCHIJAA | placebo | 1.3.4 | Placebo-1.12.2.jar | None | | UCHIJAA | plants2 | 2.8.7 | Plants-Mod-1.12.2.jar | None | | UCHIJAA | pcb | 1.5.0 | Portable-Craft-Bench-Mod-1.12.2.jar | None | | UCHIJAA | realworld | 1.18 | RealWorld-Mod-1.12.2.jar | None | | UCHIJAA | saltmod | 1.12_d | Salty-Mod-1.12.2.jar | None | | UCHIJAA | forgelin | 1.5.1 | Shadowfacts-Forgelin-1.12.2.jar | None | | UCHIJAA | shipwrecks_winslow | 2.0.0 | Shipwrecks-Mod-1.12.2.jar | None | | UCHIJAA | signpost | 1.05.5 | Signpost-Mod-1.12.2.jar | None | | UCHIJAA | simpledivegear | 1.0.1 | Simple-Diving-Gear-Mod-1.12.2.jar | None | | UCHIJAA | lteleporters | 1.12.2-3.0.2 | Simple-Teleporters-Mod-1.12.2.jar | None | | UCHIJAA | stonesbricks | 1.15 | Stones-and-Bricks-Mod-1.12.2.jar | None | | UCHIJAA | storagedrawers | 1.12-5.2.5 | Storage-Drawers-Mod-1.12.jar | None | | UCHIJAA | tlsywen | 1.0 | The-Last-Sword-You-Will-Ever-Need-Mod-1.12.2.jar | None | | UCHIJAA | bspkrscore | at_0.9 | TreeCapitator-Mod-1.12.jar | None | | UCHIJAA | treecapitator | at_0.9 | TreeCapitator-Mod-1.12.jar | None | | UCHIJAA | tumbleweed | 1.11-0.4.4 | Tumbleweed-Mod-1.12.1.jar | None | | UCHIJAA | twilightforest | 3.7.424 | Twilight-Forest-Mod-1.12.2.jar | None | | UCHIJAA | worldedit | 6.1.8 | WorldEdit-1.12.jar | None | | UCHIJAA | pvj | 1.3.2 | Project-Vibrant-Journeys-Mod-1.12.2.jar | None |
Loaded coremods (and transformers): CXLibraryCore (CXLibrary-1.12.1.jar) cubex2.cxlibrary.CoreModTransformerCreativePatchingLoader (CreativeCore-1.12.2.jar) ForgelinPlugin (Shadowfacts-Forgelin-1.12.2.jar) LoadingPlugin (Quark-Mod-1.12.1.jar) vazkii.quark.base.asm.ClassTransformerComfortsLoadingPlugin (Comforts-Mod-1.12.2.jar) c4.comforts.asm.SleepTransformer 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'

Any help is appreciated. Thank you!

Remove or get another version of biomesoplenty

It's a bug between Additional Structures and Biomes O'Plenty.
Update Additional Structures to version 1.4.0 or newer.
Download it here: https://minecraft.curseforge.com/projects/additional-structures/files

See this: https://minecraft.curseforge.com/projects/additional-structures/issues/1