"WARNING: coremods are present" while installing RLCraft

[iDoomful]

I've gotten this while trying to manually install RLCraft using the MultiMC launcher

 

---- Minecraft Crash Report ----

WARNING: coremods are present:
  LibLoader (# LibLoader.jar)
  CreativePatchingLoader (CreativeCore_v1.9.74_mc1.12.2.jar)
  SSLoadingPlugin (SereneSeasons-1.12.2-1.2.18-universal.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-0.10.9-1.12.2.jar)
  ForgelinPlugin (Forgelin-1.8.4.jar)
  Inventory Tweaks Coremod (InventoryTweaks-1.64+dev.146.jar)
  TransformLoader (DynamicSurroundings-1.12.2-3.6.0.2.jar)
  LoadingPlugin (Bloodmoon-MC1.12.2-1.5.3.jar)
  llibrary (llibrary-core-1.0.11-1.12.2.jar)
  PhosphorFMLLoadingPlugin (phosphor-1.12.2-0.2.6+build50-universal.jar)
  ItemPatchingLoader (ItemPhysic_Full_1.4.27_mc1.12.2.jar)
  MMFMLCorePlugin (MultiMine-1.12.2.jar)
  LoadingPlugin (ResourceLoader-MC1.12.1-1.5.3.jar)
  CoreMod (TickProfiler-1.12-0.0.7.jar)
  BetterFoliageLoader (BetterFoliage-MC1.12-2.2.0.jar)
  IvToolkit (IvToolkit-1.3.3-1.12.jar)
  LoadingPlugin (Reskillable-1.12.2-1.13.0.jar)
  TNTUtilities Core (tnt_utilities-mc1.12-1.2.3.jar)
  CorePlugin (ForgeEndertech-1.12.2-4.4.25.0-build.0428.jar)
  LoadingPlugin (ChunkAnimator-MC1.12-1.2.jar)
Contact their authors BEFORE contacting forge

// Hey, that tickles! Hehehe!

Time: 1/24/20 4:46 PM
Description: Initializing game

java.lang.NoSuchMethodError: net.minecraftforge.fml.relauncher.ReflectionHelper.findField(Ljava/lang/Class;Ljava/lang/String;Ljava/lang/String;)Ljava/lang/reflect/Field;
    at net.minecraft.util.SoundCategory.<clinit>(SourceFile:39)
    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 java.lang.Class.getEnumConstantsShared(Unknown Source)
    at java.lang.System$2.getEnumConstantsShared(Unknown Source)
    at java.util.EnumMap.getKeyUniverse(Unknown Source)
    at java.util.EnumMap.<init>(Unknown Source)
    at com.google.common.collect.Maps.newEnumMap(Maps.java:481)
    at net.minecraft.client.settings.GameSettings.<init>(GameSettings.java:143)
    at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:443)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:377)
    at net.minecraft.client.main.Main.main(SourceFile:123)
    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.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
    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 org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196)
    at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231)
    at org.multimc.EntryPoint.listen(EntryPoint.java:143)
    at org.multimc.EntryPoint.main(EntryPoint.java:34)

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

-- Head --
Thread: Client thread
Stacktrace:
    at net.minecraft.util.SoundCategory.<clinit>(SourceFile:39)
    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 java.lang.Class.getEnumConstantsShared(Unknown Source)
    at java.lang.System$2.getEnumConstantsShared(Unknown Source)
    at java.util.EnumMap.getKeyUniverse(Unknown Source)
    at java.util.EnumMap.<init>(Unknown Source)
    at com.google.common.collect.Maps.newEnumMap(Maps.java:481)
    at net.minecraft.client.settings.GameSettings.<init>(GameSettings.java:143)
    at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:443)

-- Initialization --
Details:
Stacktrace:
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:377)
    at net.minecraft.client.main.Main.main(SourceFile:123)
    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.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
    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 org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196)
    at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231)
    at org.multimc.EntryPoint.listen(EntryPoint.java:143)
    at org.multimc.EntryPoint.main(EntryPoint.java:34)

-- System Details --
Details:
    Minecraft Version: 1.12.2
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_231, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 2927632280 bytes (2792 MB) / 3207856128 bytes (3059 MB) up to 4281597952 bytes (4083 MB)
    JVM Flags: 7 total; -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms3072m -Xmx4096m
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: 
    Loaded coremods (and transformers): 
LibLoader (# LibLoader.jar)
  
CreativePatchingLoader (CreativeCore_v1.9.74_mc1.12.2.jar)
  
SSLoadingPlugin (SereneSeasons-1.12.2-1.2.18-universal.jar)
  sereneseasons.asm.transformer.EntityRendererTransformer
  sereneseasons.asm.transformer.WorldTransformer
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-0.10.9-1.12.2.jar)
  pl.asie.foamfix.coremod.FoamFixTransformer
ForgelinPlugin (Forgelin-1.8.4.jar)
  
Inventory Tweaks Coremod (InventoryTweaks-1.64+dev.146.jar)
  invtweaks.forge.asm.ContainerTransformer
TransformLoader (DynamicSurroundings-1.12.2-3.6.0.2.jar)
  
LoadingPlugin (Bloodmoon-MC1.12.2-1.5.3.jar)
  lumien.bloodmoon.asm.ClassTransformer
llibrary (llibrary-core-1.0.11-1.12.2.jar)
  net.ilexiconn.llibrary.server.core.plugin.LLibraryTransformer
  net.ilexiconn.llibrary.server.core.patcher.LLibraryRuntimePatcher
PhosphorFMLLoadingPlugin (phosphor-1.12.2-0.2.6+build50-universal.jar)
  
ItemPatchingLoader (ItemPhysic_Full_1.4.27_mc1.12.2.jar)
  com.creativemd.itemphysic.ItemTransformer
MMFMLCorePlugin (MultiMine-1.12.2.jar)
  atomicstryker.multimine.common.fmlmagic.MMTransformer
LoadingPlugin (ResourceLoader-MC1.12.1-1.5.3.jar)
  lumien.resourceloader.asm.ClassTransformer
CoreMod (TickProfiler-1.12-0.0.7.jar)
  
BetterFoliageLoader (BetterFoliage-MC1.12-2.2.0.jar)
  mods.betterfoliage.loader.BetterFoliageTransformer
IvToolkit (IvToolkit-1.3.3-1.12.jar)
  
LoadingPlugin (Reskillable-1.12.2-1.13.0.jar)
  codersafterdark.reskillable.base.asm.ClassTransformer
TNTUtilities Core (tnt_utilities-mc1.12-1.2.3.jar)
  ljfa.tntutils.asm.ExplosionTransformer
CorePlugin (ForgeEndertech-1.12.2-4.4.25.0-build.0428.jar)
  
LoadingPlugin (ChunkAnimator-MC1.12-1.2.jar)
  lumien.chunkanimator.asm.ClassTransformer
    Launched Version: MultiMC5
    LWJGL: 2.9.4
    OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
    GL Caps: 
    Using VBOs: ~~ERROR~~ NullPointerException: null
    Is Modded: Definitely; Client brand changed to 'fml,forge'
    Type: Client (map_client.txt)
    Resource Packs: ~~ERROR~~ NullPointerException: null
    Current Language: ~~ERROR~~ NullPointerException: null
    Profiler Position: N/A (disabled)
    CPU: <unknown>