Crash on world load with biomes o plenty world type. Happens with every update after 10.0.0.313
Tried with no other mods but biomes o plenty with same results, forge is updated to latest version. Can't load any previous saves either.

---- Minecraft Crash Report ----
// My bad.

Time: 2/17/20 10:42 PM
Description: Exception in server tick loop

java.lang.ExceptionInInitializerError: null
at biomesoplenty.common.world.BOPLayerUtil.createBiomeFactory(BOPLayerUtil.java:109) ~[?:?] {re:classloading}
at biomesoplenty.common.world.BOPLayerUtil.createAreaFactories(BOPLayerUtil.java:141) ~[?:?] {re:classloading}
at biomesoplenty.common.world.BOPLayerUtil.createGenLayers(BOPLayerUtil.java:180) ~[?:?] {re:classloading}
at biomesoplenty.common.world.BOPBiomeProvider.(BOPBiomeProvider.java:42) ~[?:?] {re:classloading}
at biomesoplenty.common.world.WorldTypeBOP.createChunkGenerator(WorldTypeBOP.java:36) ~[?:?] {re:classloading}
at net.minecraft.world.server.ServerWorld.lambda$new$3(ServerWorld.java:172) ~[?:?] {re:classloading}
at net.minecraft.world.server.ServerWorld$$Lambda$3963/1784081854.apply(Unknown Source) ~[?:?] {}
at net.minecraft.world.World.(World.java:98) ~[?:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.world.server.ServerWorld.(ServerWorld.java:171) ~[?:?] {re:classloading}
at net.minecraft.server.MinecraftServer.func_213194_a(MinecraftServer.java:373) ~[?:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:78) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:96) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:611) [?:?] {re:classloading,pl:accesstransformer:B}
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51] {}
Caused by: java.util.NoSuchElementException: No value present
at java.util.Optional.get(Optional.java:135) ~[?:1.8.0_51] {}
at biomesoplenty.common.world.layer.BOPBiomeEdgeLayer.(BOPBiomeEdgeLayer.java:47) ~[?:?] {re:classloading}
... 14 more

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

-- System Details --
Details:
Minecraft Version: 1.15.2
Minecraft Version ID: 1.15.2
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: 11208905216 bytes (10689 MB) / 12683575296 bytes (12096 MB) up to 12884901888 bytes (12288 MB)
CPUs: 8
JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx12G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
ModLauncher: 5.0.0-milestone.4+67+b1a340b
ModLauncher launch target: fmlclient
ModLauncher naming: srg
ModLauncher services:
/eventbus-2.0.0-milestone.1-service.jar eventbus PLUGINSERVICE
/forge-1.15.2-31.1.14.jar object_holder_definalize PLUGINSERVICE
/forge-1.15.2-31.1.14.jar runtime_enum_extender PLUGINSERVICE
/accesstransformers-2.0.0-milestone.1-shadowed.jar accesstransformer PLUGINSERVICE
/forge-1.15.2-31.1.14.jar capability_inject_definalize PLUGINSERVICE
/forge-1.15.2-31.1.14.jar runtimedistcleaner PLUGINSERVICE
/forge-1.15.2-31.1.14.jar fml TRANSFORMATIONSERVICE
FML: 31.1
Forge: net.minecraftforge:31.1.14
FML Language Providers:
[email protected]
minecraft@1
Mod List:
forge-1.15.2-31.1.14-client.jar Minecraft {[email protected] DONE}
forge-1.15.2-31.1.14-universal.jar Forge {[email protected] DONE}
BiomesOPlenty-1.15.2-10.0.0.329-universal.jar Biomes O' Plenty {[email protected] DONE}
Player Count: 0 / 8; []
Data Packs: vanilla, mod:biomesoplenty, mod:forge (incompatible)
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'forge'

Solved: Deleting config solved this issue.