---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 20-6-10 上午11:58
Description: Ticking block entity

java.lang.RuntimeException: Attempted to load class net/minecraft/client/world/ClientWorld for invalid dist DEDICATED_SERVER
at net.minecraftforge.fml.loading.RuntimeDistCleaner.processClass(RuntimeDistCleaner.java:71) ~[forge-1.15.2-31.2.9.jar:31.2] {}
at cpw.mods.modlauncher.serviceapi.ILaunchPluginService.processClass(ILaunchPluginService.java:103) ~[modlauncher-5.1.0.jar:5.1.0+69+master.79f13f7] {}
at cpw.mods.modlauncher.LaunchPluginHandler.offerClassNodeToPlugins(LaunchPluginHandler.java:85) ~[modlauncher-5.1.0.jar:?] {}
at cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:115) ~[modlauncher-5.1.0.jar:?] {}
at cpw.mods.modlauncher.TransformingClassLoader$DelegatedClassLoader.findClass(TransformingClassLoader.java:239) ~[modlauncher-5.1.0.jar:?] {}
at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:126) ~[modlauncher-5.1.0.jar:?] {}
at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:96) ~[modlauncher-5.1.0.jar:?] {}
at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_251] {}
at com.simibubi.create.content.schematics.block.SchematicannonTileEntity.initializePrinter(SchematicannonTileEntity.java:550) ~[?:mc1.15.2_v0.2.4c] {re:classloading,pl:runtimedistcleaner:A}
at com.simibubi.create.content.schematics.block.SchematicannonTileEntity.tickPaperPrinter(SchematicannonTileEntity.java:800) ~[?:mc1.15.2_v0.2.4c] {re:classloading,pl:runtimedistcleaner:A}
at com.simibubi.create.content.schematics.block.SchematicannonTileEntity.func_73660_a(SchematicannonTileEntity.java:306) ~[?:mc1.15.2_v0.2.4c] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.world.World.func_217391_K(World.java:473) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:368) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:849) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:330) ~[?:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:784) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:637) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at java.lang.Thread.run(Unknown Source) [?:1.8.0_251] {}

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

-- Head --
Thread: Server thread
Stacktrace:
at net.minecraftforge.fml.loading.RuntimeDistCleaner.processClass(RuntimeDistCleaner.java:71)
at cpw.mods.modlauncher.serviceapi.ILaunchPluginService.processClass(ILaunchPluginService.java:103)
at cpw.mods.modlauncher.LaunchPluginHandler.offerClassNodeToPlugins(LaunchPluginHandler.java:85)
at cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:115)
at cpw.mods.modlauncher.TransformingClassLoader$DelegatedClassLoader.findClass(TransformingClassLoader.java:239)
at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:126)
at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:96)
at java.lang.ClassLoader.loadClass(Unknown Source)
at com.simibubi.create.content.schematics.block.SchematicannonTileEntity.initializePrinter(SchematicannonTileEntity.java:550)
at com.simibubi.create.content.schematics.block.SchematicannonTileEntity.tickPaperPrinter(SchematicannonTileEntity.java:800)
at com.simibubi.create.content.schematics.block.SchematicannonTileEntity.func_73660_a(SchematicannonTileEntity.java:306)

-- Block entity being ticked --
Details:
Name: create:schematicannon // com.simibubi.create.content.schematics.block.SchematicannonTileEntity
Block: Block{create:schematicannon}
Block location: World: (231,73,219), Chunk: (at 7,4,11 in 14,13; contains blocks 224,0,208 to 239,255,223), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Block: Block{create:schematicannon}
Block location: World: (231,73,219), Chunk: (at 7,4,11 in 14,13; contains blocks 224,0,208 to 239,255,223), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
at net.minecraft.world.World.func_217391_K(World.java:473)
at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:368)

-- Affected level --
Details:
All players: 1 total; [ServerPlayerEntity['gloomy_banana'/186, l='world', x=232.75, y=73.00, z=217.19]]
Chunk stats: ServerChunkCache: 2179
Level dimension: DimensionType{minecraft:overworld}
Level name: world
Level seed: 1640435034851723270
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options: {}
Level spawn location: World: (240,70,212), Chunk: (at 0,4,4 in 15,13; contains blocks 240,0,208 to 255,255,223), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 1733 game time, 1733 day time
Known server brands: forge
Level was modded: true
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 63716 (now: false), thunder time: 164619 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:849)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:330)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:784)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:637)
at java.lang.Thread.run(Unknown Source)

-- 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_251, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 601687592 bytes (573 MB) / 1753743360 bytes (1672 MB) up to 3817865216 bytes (3641 MB)
CPUs: 8
JVM Flags: 1 total; -Xmx4g
ModLauncher: 5.1.0+69+master.79f13f7
ModLauncher launch target: fmlserver
ModLauncher naming: srg
ModLauncher services:
/eventbus-2.2.0-service.jar eventbus PLUGINSERVICE
/forge-1.15.2-31.2.9.jar object_holder_definalize PLUGINSERVICE
/forge-1.15.2-31.2.9.jar runtime_enum_extender PLUGINSERVICE
/accesstransformers-2.1.1-shadowed.jar accesstransformer PLUGINSERVICE
/forge-1.15.2-31.2.9.jar capability_inject_definalize PLUGINSERVICE
/forge-1.15.2-31.2.9.jar runtimedistcleaner PLUGINSERVICE
/forge-1.15.2-31.2.9.jar fml TRANSFORMATIONSERVICE
FML: 31.2
Forge: net.minecraftforge:31.2.9
FML Language Providers:
[email protected]
minecraft@1
Mod List:
forge-1.15.2-31.2.9-server.jar Minecraft {[email protected] DONE}
forge-1.15.2-31.2.9-universal.jar Forge {[email protected] DONE}
create-mc1.15.2_v0.2.4c-all.jar Create {[email protected]_v0.2.4c DONE}
Player Count: 1 / 20; [ServerPlayerEntity['gloomy_banana'/186, l='world', x=232.75, y=73.00, z=217.19]]
Data Packs: vanilla, mod:forge (incompatible), mod:create
Is Modded: Definitely; Server brand changed to 'forge'
Type: Dedicated Server (map_server.txt)

We're also getting this on Vazkii's patron server

Here's the crashlog from our server. Not sure exactly what was being done at the time but it had to do with the schematicannon
crash-2020-06-11_18.45.18-server.txt

Thanks for reporting, this is fixed in 0.2.4d