Server Crashing Please help (NEW TO MODDING)

[DevXYZ]

Spoiler

---- Minecraft Crash Report ----

WARNING: coremods are present:
  TransformLoader (DynamicSurroundings-1.12.2-3.6.1.0.jar)
  SSLoadingPlugin (SereneSeasons-1.12.2-1.2.18-universal.jar)
  TransformerLoader (OpenComputers-MC1.12.2-1.7.5.192.jar)
  ForgelinPlugin (Forgelin-1.8.4.jar)
  Do not report to Forge! (If you haven't disabled the FoamFix coremod, try disabling it in the config! Note that this bit of text will still appear.) (foamfix-0.10.14-1.12.2.jar)
  Quark Plugin (Quark-r1.6-179.jar)
  ApotheosisCore (Apotheosis-1.12.2-1.12.5.jar)
  ObfuscatePlugin (obfuscate-0.4.2-1.12.2.jar)
  iceandfire (iceandfire-1.9.1-1.12.2.jar)
  FarseekCoreMod (Farseek-1.12-2.5.1.jar)
  Born in a Barn (Born In A Barn V1.8-1.12-1.1.jar)
  llibrary (llibrary-core-1.0.11-1.12.2.jar)
  AstralCore (astralsorcery-1.12.2-1.10.27.jar)
  Controllable (controllable-0.11.2-1.12.2.jar)
  FutureMC (future-mc-1.12.2-0.2.7.4.jar)
  PhosphorFMLLoadingPlugin (phosphor-1.12.2-0.2.6+build50-universal.jar)
  XaeroWorldMapPlugin (XaerosWorldMap_1.18.1_Forge_1.12.jar)
  XaeroMinimapPlugin (Xaeros_Minimap_21.21.0_Forge_1.12.jar)
  SurgeLoadingPlugin (Surge-1.12.2-2.0.77.jar)
  CreativePatchingLoader (CreativeCore_v1.10.65_mc1.12.2.jar)
  LoadingPlugin (Reskillable-1.12.2-1.13.0.jar)
Contact their authors BEFORE contacting forge

// You should try our sister game, Minceraft!

Time: 3/11/21 10:17 PM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/client/gui/toasts/IToast
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at net.minecraftforge.fml.common.Loader.identifyMods(Loader.java:379)
    at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:568)
    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: net.minecraft.client.gui.toasts.IToast
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 9 more
Caused by: java.lang.NullPointerException
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
    ... 11 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_311, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 2003061056 bytes (1910 MB) / 2717384704 bytes (2591 MB) up to 2717384704 bytes (2591 MB)
    JVM Flags: 2 total; -Xmx2704M -Xms2704M
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP 9.42 Powered by Forge 14.23.5.2855 7 mods loaded, 0 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                                |
    |:----- |:------------------ |:------------ |:------------- |:---------------------------------------- |
    |       | minecraft          | 1.12.2       | minecraft.jar | None                                     |
    |       | mcp                | 9.42         | minecraft.jar | None                                     |
    |       | FML                | 8.0.99.99    | server.jar    | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    |       | forge              | 14.23.5.2855 | server.jar    | e3c3d50c7c986df74c645c0ac54639741c90a557 |
    |       | creativecoredummy  | 1.0.0        | minecraft.jar | None                                     |
    |       | xaerominimap_core  | 1.12.2-1.0   | minecraft.jar | None                                     |
    |       | xaeroworldmap_core | 1.12.2-1.0   | minecraft.jar | None                                     |

    Loaded coremods (and transformers):
TransformLoader (DynamicSurroundings-1.12.2-3.6.1.0.jar)
 
SSLoadingPlugin (SereneSeasons-1.12.2-1.2.18-universal.jar)
  sereneseasons.asm.transformer.EntityRendererTransformer
  sereneseasons.asm.transformer.WorldTransformer
TransformerLoader (OpenComputers-MC1.12.2-1.7.5.192.jar)
  li.cil.oc.common.asm.ClassTransformer
ForgelinPlugin (Forgelin-1.8.4.jar)
 
Do not report to Forge! (If you haven't disabled the FoamFix coremod, try disabling it in the config! Note that this bit of text will still appear.) (foamfix-0.10.14-1.12.2.jar)
  pl.asie.foamfix.coremod.FoamFixTransformer
Quark Plugin (Quark-r1.6-179.jar)
  vazkii.quark.base.asm.ClassTransformer
ApotheosisCore (Apotheosis-1.12.2-1.12.5.jar)
  shadows.ApotheosisTransformer
ObfuscatePlugin (obfuscate-0.4.2-1.12.2.jar)
  com.mrcrayfish.obfuscate.asm.ObfuscateTransformer
iceandfire (iceandfire-1.9.1-1.12.2.jar)
  com.github.alexthe666.iceandfire.patcher.IceAndFireRuntimePatcher
FarseekCoreMod (Farseek-1.12-2.5.1.jar)
  farseek.core.FarseekClassTransformer
Born in a Barn (Born In A Barn V1.8-1.12-1.1.jar)
  com.chocohead.biab.BornInABarn
llibrary (llibrary-core-1.0.11-1.12.2.jar)
  net.ilexiconn.llibrary.server.core.plugin.LLibraryTransformer
  net.ilexiconn.llibrary.server.core.patcher.LLibraryRuntimePatcher
AstralCore (astralsorcery-1.12.2-1.10.27.jar)
 
Controllable (controllable-0.11.2-1.12.2.jar)
 
FutureMC (future-mc-1.12.2-0.2.7.4.jar)
  thedarkcolour.futuremc.asm.CoreTransformer
PhosphorFMLLoadingPlugin (phosphor-1.12.2-0.2.6+build50-universal.jar)
 
XaeroWorldMapPlugin (XaerosWorldMap_1.18.1_Forge_1.12.jar)
  xaero.map.core.transformer.ChunkTransformer
  xaero.map.core.transformer.NetHandlerPlayClientTransformer
  xaero.map.core.transformer.EntityPlayerTransformer
  xaero.map.core.transformer.AbstractClientPlayerTransformer
  xaero.map.core.transformer.WorldClientTransformer
  xaero.map.core.transformer.PlayerListTransformer
  xaero.map.core.transformer.BiomeColorHelperTransformer
XaeroMinimapPlugin (Xaeros_Minimap_21.21.0_Forge_1.12.jar)
  xaero.common.core.transformer.ChunkTransformer
  xaero.common.core.transformer.NetHandlerPlayClientTransformer
  xaero.common.core.transformer.EntityPlayerTransformer
  xaero.common.core.transformer.AbstractClientPlayerTransformer
  xaero.common.core.transformer.WorldClientTransformer
  xaero.common.core.transformer.EntityPlayerSPTransformer
  xaero.common.core.transformer.PlayerListTransformer
  xaero.common.core.transformer.GuiIngameForgeTransformer
  xaero.common.core.transformer.GuiBossOverlayTransformer
  xaero.common.core.transformer.ModelRendererTransformer
SurgeLoadingPlugin (Surge-1.12.2-2.0.77.jar)
 
CreativePatchingLoader (CreativeCore_v1.10.65_mc1.12.2.jar)
 
LoadingPlugin (Reskillable-1.12.2-1.13.0.jar)
  codersafterdark.reskillable.base.asm.ClassTransformer
    Profiler Position: N/A (disabled)
    Is Modded: Definitely; Server brand changed to 'fml,forge'
    Type: Dedicated Server (map_server.txt)

My Server keeps crashing please help! I just want to play modded server :(

[Luis_ST]

1.12 is no longer supported on this forum.
Please update to a modern version of Minecraft to receive support.