1.12.2 minecraft server crash (with mods

---- Minecraft Crash Report ----

WARNING: coremods are present:
Contact their authors BEFORE contacting forge

// Uh... Did I do that?

Time: 20.04.20 18:14
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: eu/ha3/matmos/Matmos
    at eu.ha3.matmos.ForgeMatmos.<init>(ForgeMatmos.java:20)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at net.minecraftforge.fml.common.ILanguageAdapter$JavaAdapter.getNewInstance(ILanguageAdapter.java:191)
    at net.minecraftforge.fml.common.FMLModContainer.constructMod(FMLModContainer.java:586)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
    at com.google.common.eventbus.Subscriber$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$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
    at com.google.common.eventbus.EventBus.post(EventBus.java:217)
    at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:136)
    at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:593)
    at net.minecraftforge.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:98)
    at net.minecraftforge.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:333)
    at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:125)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: eu.ha3.matmos.Matmos
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 39 more
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/resources/IResourceManagerReloadListener
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
    ... 41 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.resources.IResourceManagerReloadListener
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 45 more
Caused by: net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerException: Exception in class transformer net.minecraftforge.fml.common.asm.transformers.SideTransformer@1144a55a from coremod FMLCorePlugin
    at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:260)
    at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)
    ... 47 more
Caused by: java.lang.RuntimeException: Attempted to load class ceq for invalid side SERVER
    at net.minecraftforge.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:62)
    at net.minecraftforge.fml.common.asm.ASMTransformerWrapper$TransformerWrapper.transform(ASMTransformerWrapper.java:256)
    ... 49 more

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

-- System Details --
Details:
    Minecraft Version: 1.12.2
    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: 454666952 bytes (433 MB) / 638058496 bytes (608 MB) up to 1905262592 bytes (1817 MB)
    JVM Flags: 0 total; 
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP 9.42 Powered by Forge 14.23.5.2813 17 mods loaded, 17 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

    | State | ID                  | Version      | Source                                        | Signature                                |
    |:----- |:------------------- |:------------ |:--------------------------------------------- |:---------------------------------------- |
    | LC    | minecraft           | 1.12.2       | minecraft.jar                                 | None                                     |
    | LC    | mcp                 | 9.42         | minecraft.jar                                 | None                                     |
    | LC    | FML                 | 8.0.99.99    | forge-1.12.2-14.23.5.2813-universal.jar       | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    | LC    | forge               | 14.23.5.2813 | forge-1.12.2-14.23.5.2813-universal.jar       | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    | LC    | damageindicatorsmod | 1.0          | [1.12.2]DamageIndicatorsMod-3.5.1.jar         | None                                     |
    | LC    | backpack            | 3.0.2        | backpack-3.0.2-1.12.2.jar                     | None                                     |
    | LC    | bibliocraft         | 2.4.5        | BiblioCraft[v2.4.5][MC1.12.2].jar             | None                                     |
    | LC    | bspkrscore          | 7.6.0.1      | BspkrsCore-1.12.2.jar                         | None                                     |
    | LC    | customspawner       | 3.11.4       | Custom-Mob-Spawner-Mod-1.12.2.jar             | None                                     |
    | LC    | gottschcore         | 1.8.0        | GottschCore-mc1.12.2-f14.23.5.2768-v1.8.0.jar | None                                     |
    | LC    | dungeons2           | 1.7.1        | Dungeons-2-Mod-1.12.2.jar                     | None                                     |
    | L     | matmos              | 1.12.2-34.2  | matmos-1.12.2-34.2+.jar                       | None                                     |
    | L     | mocreatures         | 12.0.5       | Mo-Creatures-Mod-1.12.2.jar                   | None                                     |
    | L     | goblin_mod_reforged | 1.0.0        | Mod_Goblin_1.12.2_1.0.1_byestorc.jar          | None                                     |
    | L     | ruins               | 17.1         | Ruins-1.12.2.jar                              | None                                     |
    | L     | treecapitator       | 1.43.0       | TreeCapitator-Mod-1.12.2.jar                  | None                                     |
    | L     | twilightforest      | 3.10.1013    | twilightforest-1.12.2-3.10.1013-universal.jar | None                                     |

    Loaded coremods (and transformers): 
    Profiler Position: N/A (disabled)
    Is Modded: Definitely; Server brand changed to 'fml,forge'
    Type: Dedicated Server (map_server.txt)