Base information

MC 1.12.2
forge-1.12.2-14.23.5.2838-universal.jar
Draconic-Evolution-1.12.2-2.3.23.345-universal.jar
BrandonsCore-1.12.2-2.4.15.206-universal.jar

Crash report

[crash-2019-07-07_12.30.33-server.txt](https://github.com/brandon3055/Draconic-Evolution/files/3365512/crash-2019-07-07_12.30.33-server.txt)

Man I have the same problem!!! My versions of mode, forge and minecraft are similar (I was trying to downgrade version of draconic, but this doesn't help).

---- Minecraft Crash Report ----

WARNING: coremods are present:
SpongeCoremod (spongeforge-1.12.2-2838-7.1.7-RC3843.jar)
Contact their authors BEFORE contacting forge

// You're mean.

Time: 07.07.19 13:23
Description: Exception in server tick loop

net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Draconic Evolution (draconicevolution)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityPlayerSP
at com.brandon3055.draconicevolution.client.DEParticles.registerServer(DEParticles.java:45)
at com.brandon3055.draconicevolution.CommonProxy.registerParticles(CommonProxy.java:110)
at com.brandon3055.draconicevolution.DraconicEvolution.preInit(DraconicEvolution.java:56)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:637)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
at com.google.common.eventbus.EventBus.post(EventBus.java:217)
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219)
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150)
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76)
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399)
at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71)
at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
at com.google.common.eventbus.EventBus.post(EventBus.java:217)
at net.minecraftforge.fml.common.LoadController.redirect$forgeImpl$PostEvent$zza000(LoadController.java:568)
at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:136)
at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:627)
at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:99)
at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:333)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:125)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.entity.EntityPlayerSP
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 40 more
Caused by: net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerException: Exception in class transformer net.minecraftforge.fml.common.asm.transformers.SideTransformer@4e8e8621 from coremod FMLCorePlugin
at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:260)
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)
... 42 more
Caused by: java.lang.RuntimeException: Attempted to load class bud for invalid side SERVER
at net.minecraftforge.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:62)
at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:256)
... 44 more

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

-- Head --
Thread: Server thread
Stacktrace:
at net.minecraft.server.MinecraftServer.handler$onCrashReport$zjd000(MinecraftServer.java:4712)

-- Sponge PhaseTracker --
Details:
Phase Stack: [Empty stack]
Stacktrace:
at net.minecraft.server.MinecraftServer.handler$onCrashReport$zjd000(MinecraftServer.java:4712)
at net.minecraft.server.MinecraftServer.func_71230_b(MinecraftServer.java:889)
at net.minecraft.server.dedicated.DedicatedServer.func_71230_b(DedicatedServer.java:371)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:558)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_211, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1886265112 bytes (1798 MB) / 2537029632 bytes (2419 MB) up to 2537029632 bytes (2419 MB)
JVM Flags: 2 total; -Xmx2560M -Xms2560M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.42 Powered by Forge 14.23.5.2838 12 mods loaded, 12 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

Mods:

| State | ID                | Version                  | Source                                             | Signature                                |
|:----- |:----------------- |:------------------------ |:-------------------------------------------------- |:---------------------------------------- |
| LCH   | minecraft         | 1.12.2                   | minecraft.jar                                      | None                                     |
| LCH   | mcp               | 9.42                     | minecraft.jar                                      | None                                     |
| LCH   | FML               | 8.0.99.99                | forge-1.12.2-14.23.5.2838-universal.jar            | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCH   | forge             | 14.23.5.2838             | forge-1.12.2-14.23.5.2838-universal.jar            | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCH   | spongeapi         | 7.1.0-e29ab849e          | spongeforge-1.12.2-2838-7.1.7-RC3843.jar           | None                                     |
| LCH   | sponge            | 1.12.2-7.1.7-SNAPSHOT    | spongeforge-1.12.2-2838-7.1.7-RC3843.jar           | None                                     |
| LCH   | spongeforge       | 1.12.2-2838-7.1.7-RC3843 | spongeforge-1.12.2-2838-7.1.7-RC3843.jar           | None                                     |
| LCH   | baubles           | 1.5.2                    | Baubles-1.12-1.5.2.jar                             | None                                     |
| LCH   | codechickenlib    | 3.2.2.353                | CodeChickenLib_1.12.2_3.2.2.353_universal.jar      | f1850c39b2516232a2108a7bd84d1cb5df93b261 |
| LCH   | redstoneflux      | 2.1.0                    | RedstoneFlux-1.12-2.1.0.6-universal.jar            | 8a6abf2cb9e141b866580d369ba6548732eff25f |
| LCH   | brandonscore      | 2.4.15                   | BrandonsCore-1.12.2-2.4.15.206-universal.jar       | None                                     |
| LCE   | draconicevolution | 2.3.21                   | Draconic-Evolution-1.12.2-2.3.21.342-universal.jar | None                                     |


Plugins:

| State | ID | Version | Source | Signature |
|:----- |:-- |:------- |:------ |:--------- |

Loaded coremods (and transformers): 

SpongeCoremod (spongeforge-1.12.2-2838-7.1.7-RC3843.jar)
org.spongepowered.common.launch.transformer.SpongeSuperclassTransformer
Profiler Position: N/A (disabled)
Is Modded: Definitely; Server brand changed to 'fml,forge,sponge'
Type: Dedicated Server (map_server.txt)

Man I have the same problem!!! My versions of mode, forge and minecraft are similar (I was trying to downgrade version of draconic, but this doesn't help).

Try setting
B:removeErroringEntities=true
and maybe
B:removeErroringTileEntities=true
in forge.cfg after downgrading.

This has to be one of the most bizarre issues i have come across...
I have tracked down the cause and its an easy fix. But the code in question has not been touched since 2016 so wtf has it suddenly decided to break now?

Fixed. Please update BrandonsCore.