I've been having crashes with my modded minecraft on launch, which only seems to fix itself after I disable this mod in MultiMC.

---- Minecraft Crash Report ----

// Don't do that.

Time: 5/7/19 6:22 PM
Description: Initializing game

java.lang.NoClassDefFoundError: net/minecraft/util/registry/Registry
at io.github.cottonmc.resources.config.OreGenerationSettings.getDefault(OreGenerationSettings.java:59)
at io.github.cottonmc.resources.config.CottonResourcesConfig.(CottonResourcesConfig.java:26)
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 io.github.cottonmc.cotton.config.ConfigManager.loadConfig(ConfigManager.java:47)
at io.github.cottonmc.cotton.config.ConfigManager.loadConfig(ConfigManager.java:31)
at io.github.cottonmc.resources.CottonResources.(CottonResources.java:14)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at net.fabricmc.loader.util.DefaultLanguageAdapter.create(DefaultLanguageAdapter.java:45)
at net.fabricmc.loader.EntrypointStorage$NewEntry.create(EntrypointStorage.java:101)
at net.fabricmc.loader.EntrypointStorage$NewEntry.getOrCreate(EntrypointStorage.java:93)
at net.fabricmc.loader.EntrypointStorage.getEntrypoints(EntrypointStorage.java:140)
at net.fabricmc.loader.FabricLoader.getEntrypoints(FabricLoader.java:185)
at net.fabricmc.loader.entrypoint.hooks.EntrypointClient.start(EntrypointClient.java:34)
at net.minecraft.class_310.method_1503(class_310.java)
at net.minecraft.class_310.method_1514(class_310.java:395)
at net.minecraft.client.main.Main.main(Main.java:154)
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.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:170)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:127)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
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)
Caused by: java.lang.ClassNotFoundException: net.minecraft.util.registry.Registry
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:160)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 36 more

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

-- Head --
Thread: Client thread
Stacktrace:
at io.github.cottonmc.resources.config.OreGenerationSettings.getDefault(OreGenerationSettings.java:59)
at io.github.cottonmc.resources.config.CottonResourcesConfig.(CottonResourcesConfig.java:26)
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 io.github.cottonmc.cotton.config.ConfigManager.loadConfig(ConfigManager.java:47)
at io.github.cottonmc.cotton.config.ConfigManager.loadConfig(ConfigManager.java:31)
at io.github.cottonmc.resources.CottonResources.(CottonResources.java:14)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at net.fabricmc.loader.util.DefaultLanguageAdapter.create(DefaultLanguageAdapter.java:45)
at net.fabricmc.loader.EntrypointStorage$NewEntry.create(EntrypointStorage.java:101)
at net.fabricmc.loader.EntrypointStorage$NewEntry.getOrCreate(EntrypointStorage.java:93)
at net.fabricmc.loader.EntrypointStorage.getEntrypoints(EntrypointStorage.java:140)
at net.fabricmc.loader.FabricLoader.getEntrypoints(FabricLoader.java:185)
at net.fabricmc.loader.entrypoint.hooks.EntrypointClient.start(EntrypointClient.java:34)
at net.minecraft.class_310.method_1503(class_310.java)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.class_310.method_1514(class_310.java:395)
at net.minecraft.client.main.Main.main(Main.java:154)
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.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:170)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:127)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
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: 1.14
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_211, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 550447808 bytes (524 MB) / 1160249344 bytes (1106 MB) up to 5965348864 bytes (5689 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms512m -Xmx6400m
Fabric Mods:
abusedlib: 1.0.1
alwaysdroploot: 3.3.1+mc1.14
anvil_fix: 1.1.2
aquarius: 1.3.1+1.14
autoconfig1: 1.0.1+mc1.14
betterutilities: 1.1.1
blockus: 1.1.6.2
cardinalenergy: 1.0.0
cloth: 0.3.1+build.23
cloth-config: 0.2.1+build.14
clothesline-fabric: 0.0.16
composableautomation: 0.2.1+mc1.14
cotton: 0.6.1+1.14
cotton-client-commands: 0.3.1+1.14
cotton-resources: 0.0.7+1.14
couplings: 1.0.0
craftpresence: 1.5.3.1
crowmap: 1.0.1
darkelevators: 1.1.3
ding: 1.1.0
easyexcavate: 1.4.1
extradiscs: 1.0.2+build.3
fabriblocks: 1.1.4
fabric: 0.2.7+build.127
fabric-language-kotlin: 1.3.30+build.2
fabricloader: 0.4.6+build.141
flesh-2-leather: 0.1.0
foamfix: 0.12.1
gbfabrictools: 1.0.0
grid: 1.14-fabric0.2.7-1.4.1
illuminations: 0.1.5
leadvillagers: 1.0.0+mc1.14
leaf-decay: 1.0.0
leathercows: 1.0.0
lightoverlay: 1.1.0+build.6
modmenu: 1.5.2-82
mousewheelie: 1.1.3+1.14
overheadhp: 0.1
proletarian: 0.6.0+mc1.14-pre4
redstonebits: 1.0.2
refinedmachinery: 1.0.1
roughlyenoughitems: 2.8.2+build.104
rtree-3i-lite-fabric: 0.2.0
shulkerboxtooltip: 1.2.0+1.14.0
stockpile: 1.0.3+1.14
vanilla-hammers: 1.1.4
waila: 1.9.16
Launched Version: MultiMC5
LWJGL: 3.2.1 build 12
OpenGL: NO CONTEXT
GL Caps:
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'fabric'
Type: Client (map_client.txt)
Resource Packs: ERROR NullPointerException: null
Current Language: ERROR NullPointerException: null
CPU:

Fixed! Sorry, download the latest curse version, it should get approved soon! :)