Exception on loading/creating map

[UnFamousSoul]

Got this on crash report:

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Description: Exception initializing level

java.lang.NoClassDefFoundError: net/minecraft/class_7924
at protosky.stuctures.StructureHelper.handleStructures(StructureHelper.java:358)
at net.minecraft.class_2806.handler$caf000$FEATURES(class_2806.java:559)
at net.minecraft.class_2806.method_20613(class_2806.java)
at net.minecraft.class_2806.method_12154(class_2806.java:292)
at net.minecraft.class_3898.method_17225(class_3898.java:679)
at com.mojang.datafixers.util.Either$Left.map(Either.java:38)
at net.minecraft.class_3898.method_17224(class_3898.java:673)
at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1150)
at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482)
at net.minecraft.class_3900.method_17634(class_3900.java:62)
at net.minecraft.class_3846.method_16907(class_3846.java:91)
at net.minecraft.class_3846.method_16900(class_3846.java:146)
at net.minecraft.class_3846.run(class_3846.java:102)
at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1395)
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373)
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182)
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655)
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622)
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165)
Caused by: java.lang.ClassNotFoundException: net.minecraft.class_7924
... 19 more

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

-- Head --
Thread: Server thread
Stacktrace:
at protosky.stuctures.StructureHelper.handleStructures(StructureHelper.java:358)
at net.minecraft.class_2806.handler$caf000$FEATURES(class_2806.java:559)
at net.minecraft.class_2806.method_20613(class_2806.java)
at net.minecraft.class_2806.method_12154(class_2806.java:292)
at net.minecraft.class_3898.method_17225(class_3898.java:679)
at com.mojang.datafixers.util.Either$Left.map(Either.java:38)
at net.minecraft.class_3898.method_17224(class_3898.java:673)
at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1150)
at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482)
at net.minecraft.class_3900.method_17634(class_3900.java:62)
at net.minecraft.class_3846.method_16907(class_3846.java:91)
at net.minecraft.class_3846.method_16900(class_3846.java:146)
at net.minecraft.class_3846.run(class_3846.java:102)

-- Affected level --
Details:
All players: 0 total; []
Chunk stats: 625
Level dimension: minecraft:overworld
Level spawn location: World: (168,64,-168), Section: (at 8,0,8 in 10,4,-11; chunk contains blocks 160,-64,-176 to 175,319,-161), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,-64,-512 to 511,319,-1)
Level time: 0 game time, 0 day time
Level name: Skyblock
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Known server brands: fabric
Level was modded: true
Level storage version: 0x04ABD - Anvil
Stacktrace:
at net.minecraft.server.MinecraftServer.method_3786(MinecraftServer.java:367)
at net.minecraft.server.MinecraftServer.method_3735(MinecraftServer.java:315)
at net.minecraft.class_1132.method_3823(class_1132.java:68)
at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:636)
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:257)
at java.base/java.lang.Thread.run(Thread.java:833)

-- System Details --
Details:
Minecraft Version: 1.19.3
Minecraft Version ID: 1.19.3
Operating System: Windows 10 (amd64) version 10.0
Java Version: 17.0.3, Microsoft
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
Memory: 1622546720 bytes (1547 MiB) / 2147483648 bytes (2048 MiB) up to 2147483648 bytes (2048 MiB)
CPUs: 12
Processor Vendor: GenuineIntel
Processor Name: Intel(R) Xeon(R) CPU E5-2620 v2 @ 2.10GHz
Identifier: Intel64 Family 6 Model 62 Stepping 4
Microarchitecture: Ivy Bridge (Server)
Frequency (GHz): 2.10
Number of physical packages: 1
Number of physical CPUs: 6
Number of logical CPUs: 12
Graphics card #0 name: NVIDIA GeForce 9500 GT
Graphics card #0 vendor: NVIDIA (0x10de)
Graphics card #0 VRAM (MB): 1024.00
Graphics card #0 deviceId: 0x0640
Graphics card #0 versionInfo: DriverVersion=21.21.13.4201
Memory slot #0 capacity (MB): 2048.00
Memory slot #0 clockSpeed (GHz): 1.60
Memory slot #0 type: DDR3
Memory slot #1 capacity (MB): 8192.00
Memory slot #1 clockSpeed (GHz): 1.60
Memory slot #1 type: DDR3
Memory slot #2 capacity (MB): 2048.00
Memory slot #2 clockSpeed (GHz): 1.60
Memory slot #2 type: DDR3
Memory slot #3 capacity (MB): 8192.00
Memory slot #3 clockSpeed (GHz): 1.60
Memory slot #3 type: DDR3
Virtual memory max (MB): 28658.52
Virtual memory used (MB): 13300.88
Swap memory total (MB): 8192.00
Swap memory used (MB): 263.93
JVM Flags: 13 total; -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:+ParallelRefProcEnabled -Xms2048M -Xmx2048M -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M

[polarbub]

Can you reproduce it? If so, how?