Exception loading structure piece with id minecraft:jigsaw

[PhantumOne]

When ever I TP or use Spawn I get this message in the Console:

Paper Version: paper-1.18.jar:git-Paper-60

[15:06:24] [Paper Async Chunk Task Thread PaperMC/papermc.io#1/ERROR]: Exception loading structure piece with id minecraft:jigsaw
java.lang.NullPointerException: Cannot read field "nextInKToVBucket" because "bucketEntry" is null
at com.google.common.collect.HashBiMap.delete(HashBiMap.java:155) ~[guava-31.0.1-jre.jar:?]
at com.google.common.collect.HashBiMap.put(HashBiMap.java:316) ~[guava-31.0.1-jre.jar:?]
at com.google.common.collect.HashBiMap.put(HashBiMap.java:290) ~[guava-31.0.1-jre.jar:?]
at net.minecraft.core.MappedRegistry.registerMapping(MappedRegistry.java:81) ~[?:?]
at net.minecraft.core.MappedRegistry.registerOrOverride(MappedRegistry.java:115) ~[?:?]
at net.minecraft.resources.RegistryReadOps.readAndRegisterElement(RegistryReadOps.java:124) ~[paper-1.18.jar:git-Paper-60]
at net.minecraft.resources.RegistryReadOps.lambda$decodeElement$3(RegistryReadOps.java:80) ~[paper-1.18.jar:git-Paper-60]
at net.minecraft.resources.RegistryFileCodec.decode(RegistryFileCodec.java:50) ~[paper-1.18.jar:git-Paper-60]
at com.mojang.serialization.Decoder.parse(Decoder.java:18) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.codecs.FieldDecoder.decode(FieldDecoder.java:29) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.MapCodec$1.decode(MapCodec.java:34) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.codecs.RecordCodecBuilder$Instance$5.decode(RecordCodecBuilder.java:324) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.codecs.RecordCodecBuilder$2.decode(RecordCodecBuilder.java:107) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.codecs.KeyDispatchCodec.lambda$null$1(KeyDispatchCodec.java:67) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.DataResult.lambda$flatMap$10(DataResult.java:138) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[paper-1.18.jar:?]
at com.mojang.serialization.DataResult.flatMap(DataResult.java:136) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.codecs.KeyDispatchCodec.lambda$decode$2(KeyDispatchCodec.java:58) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.DataResult.lambda$flatMap$10(DataResult.java:138) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[paper-1.18.jar:?]
at com.mojang.serialization.DataResult.flatMap(DataResult.java:136) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.codecs.KeyDispatchCodec.decode(KeyDispatchCodec.java:56) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.MapDecoder.lambda$compressedDecode$0(MapDecoder.java:52) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.DataResult.lambda$flatMap$10(DataResult.java:138) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[paper-1.18.jar:?]
at com.mojang.serialization.DataResult.flatMap(DataResult.java:136) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.MapDecoder.compressedDecode(MapDecoder.java:52) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.MapCodec$MapCodecCodec.decode(MapCodec.java:91) ~[datafixerupper-4.0.26.jar:?]
at com.mojang.serialization.Decoder.parse(Decoder.java:18) ~[datafixerupper-4.0.26.jar:?]
at net.minecraft.world.level.levelgen.structure.PoolElementStructurePiece.lambda$new$0(PoolElementStructurePiece.java:54) ~[?:?]
at net.minecraft.world.level.levelgen.structure.pieces.PiecesContainer.load(PiecesContainer.java:74) ~[paper-1.18.jar:git-Paper-60]
at net.minecraft.world.level.levelgen.feature.StructureFeature.loadStaticStart(StructureFeature.java:129) ~[paper-1.18.jar:git-Paper-60]
at net.minecraft.world.level.chunk.storage.ChunkSerializer.unpackStructureStart(ChunkSerializer.java:790) ~[?:?]
at net.minecraft.world.level.chunk.storage.ChunkSerializer.loadChunk(ChunkSerializer.java:363) ~[?:?]
at com.destroystokyo.paper.io.chunk.ChunkLoadTask.executeTask(ChunkLoadTask.java:106) ~[paper-1.18.jar:git-Paper-60]
at com.destroystokyo.paper.io.chunk.ChunkLoadTask.run(ChunkLoadTask.java:38) ~[paper-1.18.jar:git-Paper-60]
at com.destroystokyo.paper.io.QueueExecutorThread.pollTasks(QueueExecutorThread.java:105) ~[paper-1.18.jar:git-Paper-60]
at com.destroystokyo.paper.io.QueueExecutorThread.run(QueueExecutorThread.java:38) ~[paper-1.18.jar:git-Paper-60]

[Tsoccerguy3]

latest.log

I'm getting a similar error on start up when Paper 1.18.1 build 68 loads the world spawn

[Lisible]

I'm getting that error on a 1.16~1.17 map with Paper 1.18.1 build 71.

[electronicboy]

dismiss my last comment, I misread

[MrApik]

I'm getting similar exception (but with WorldGenFeaturePillagerOutpostPoolPiece) - with Paper 1.18.1 build 73. Exception occures when players are teleporting.

[Creeper36]

I am getting:
ERROR: Exception loading structure piece with id minecraft:jigsaw
java.long.IllegalStateException: Invalid pool element found

on 1.18.1 build 81 but its a really old map and just updated from build 52 lol

[Sirraide]

Yeah, I'm also having that problem

[electronicboy]

Missing pool elements are irrelevant to this issue, this is about an actual exception in the server

Vanilla is mutating a collection concurrently

[MayaValentia]

Reproduced this exception on a world converted from Paper 1.17.1.
Server is on Paper version git-Paper-129 (MC: 1.18.1) (Implementing API version 1.18.1-R0.1-SNAPSHOT) (Git: d0b8b1e)

[15:13:12] [Paper Async Chunk Task Thread #0/ERROR]: No key placement in MapLike[{config:{blacklist:[],block_placer:{type:"minecraft:simple_block_placer"},can_replace:0b,need_water:0b,project:1b,state_provider:{type:"minecraft:plain_flower_provider"},tries:64,whitelist:[],xspread:7,yspread:3,zspread:7},type:"minecraft:flower"}]; No key feature in MapLike[{config:{blacklist:[],block_placer:{type:"minecraft:simple_block_placer"},can_replace:0b,need_water:0b,project:1b,state_provider:{type:"minecraft:plain_flower_provider"},tries:64,whitelist:[],xspread:7,yspread:3,zspread:7},type:"minecraft:flower"}]
[15:13:12] [Paper Async Chunk Task Thread #0/ERROR]: Exception loading structure piece with id minecraft:jigsaw
java.lang.IllegalStateException: Invalid pool element found
        at net.minecraft.world.level.levelgen.structure.PoolElementStructurePiece.lambda$new$0(PoolElementStructurePiece.java:54) ~[?:?]
        at java.util.Optional.orElseThrow(Optional.java:403) ~[?:?]
        at net.minecraft.world.level.levelgen.structure.PoolElementStructurePiece.lambda$new$0(PoolElementStructurePiece.java:54) ~[?:?]
        at net.minecraft.world.level.levelgen.structure.pieces.PiecesContainer.load(PiecesContainer.java:74) ~[paper-1.18.1.jar:git-Paper-129]
        at net.minecraft.world.level.levelgen.feature.StructureFeature.loadStaticStart(StructureFeature.java:129) ~[paper-1.18.1.jar:git-Paper-129]
        at net.minecraft.world.level.chunk.storage.ChunkSerializer.unpackStructureStart(ChunkSerializer.java:796) ~[?:?]
        at net.minecraft.world.level.chunk.storage.ChunkSerializer.loadChunk(ChunkSerializer.java:369) ~[?:?]
        at com.destroystokyo.paper.io.chunk.ChunkLoadTask.executeTask(ChunkLoadTask.java:107) ~[paper-1.18.1.jar:git-Paper-129]
        at com.destroystokyo.paper.io.chunk.ChunkLoadTask.run(ChunkLoadTask.java:38) ~[paper-1.18.1.jar:git-Paper-129]
        at com.destroystokyo.paper.io.QueueExecutorThread.pollTasks(QueueExecutorThread.java:105) ~[paper-1.18.1.jar:git-Paper-129]
        at com.destroystokyo.paper.io.QueueExecutorThread.run(QueueExecutorThread.java:38) ~[paper-1.18.1.jar:git-Paper-129]