I have downloaded the avatar mod, and it worked fine, but suddenly it starts crashing. Here is my crash report. I get the exact same crash report every time. And I have deleted every other mod I had installed except form avatar and it keeps crashing. I hope you can help me.

---- Minecraft Crash Report ----

WARNING: coremods are present:
llibrary (llibrary-core-1.0.11-1.12.2.jar)
TransformLoader (DynamicSurroundings-1.12.2-3.6.1.0.jar)
Inventory Tweaks Coremod (InventoryTweaks-1.63.jar)
iceandfire (iceandfire-1.9.1-1.12.2.jar)
Contact their authors BEFORE contacting forge

// Don't do that.

Time: 6/8/20 5:31 PM
Description: There was a severe problem during mod loading that has caused the game to fail

net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Avatar Mod: Out of the Iceberg (avatarmod)
Caused by: unacceptable code point ' ' (0x0) special characters are not allowed
in "'string'", position 0
at com.crowsofwar.avatar.snakeyaml.reader.StreamReader.update(StreamReader.java:211)
at com.crowsofwar.avatar.snakeyaml.reader.StreamReader.ensureEnoughData(StreamReader.java:176)
at com.crowsofwar.avatar.snakeyaml.reader.StreamReader.ensureEnoughData(StreamReader.java:171)
at com.crowsofwar.avatar.snakeyaml.reader.StreamReader.peek(StreamReader.java:126)
at com.crowsofwar.avatar.snakeyaml.scanner.ScannerImpl.scanToNextToken(ScannerImpl.java:1177)
at com.crowsofwar.avatar.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:287)
at com.crowsofwar.avatar.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:227)
at com.crowsofwar.avatar.snakeyaml.parser.ParserImpl$ParseImplicitDocumentStart.produce(ParserImpl.java:195)
at com.crowsofwar.avatar.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:158)
at com.crowsofwar.avatar.snakeyaml.parser.ParserImpl.checkEvent(ParserImpl.java:148)
at com.crowsofwar.avatar.snakeyaml.composer.Composer.getSingleNode(Composer.java:107)
at com.crowsofwar.avatar.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:139)
at com.crowsofwar.avatar.snakeyaml.Yaml.loadFromReader(Yaml.java:524)
at com.crowsofwar.avatar.snakeyaml.Yaml.load(Yaml.java:437)
at com.crowsofwar.gorecore.config.ConfigLoader.loadMap(ConfigLoader.java:404)
at com.crowsofwar.gorecore.config.ConfigLoader.load(ConfigLoader.java:464)
at com.crowsofwar.gorecore.config.ConfigLoader.load(ConfigLoader.java:436)
at com.crowsofwar.avatar.common.config.ConfigStats.load(ConfigStats.java:296)
at com.crowsofwar.avatar.AvatarMod.preInit(AvatarMod.java:145)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:637)
at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
at com.google.common.eventbus.Subscriber$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$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116)
at com.google.common.eventbus.EventBus.post(EventBus.java:217)
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219)
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91)
at com.google.common.eventbus.Subscriber$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.preinitializeMods(Loader.java:629)
at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:252)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:467)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:378)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

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_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1010971240 bytes (964 MB) / 1300758528 bytes (1240 MB) up to 3008888832 bytes (2869 MB)
JVM Flags: 4 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3228m -Xms256m -XX:PermSize=256m
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.42 Powered by Forge 14.23.5.2854 33 mods loaded, 33 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 |
|:----- |:------------------ |:------------------------ |:---------------------------------------- |:---------------------------------------- |
| LCH | minecraft | 1.12.2 | minecraft.jar | None |
| LCH | mcp | 9.42 | minecraft.jar | None |
| LCH | FML | 8.0.99.99 | forge-1.12.2-14.23.5.2854.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCH | forge | 14.23.5.2854 | forge-1.12.2-14.23.5.2854.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCH | gorecore | 1.12.2-0.4.5 | avatarmod-1.5.17-alpha.jar | None |
| LCE | avatarmod | 1.5.17-alpha | avatarmod-1.5.17-alpha.jar | None |
| LC | crafttweaker | 4.1.20 | CraftTweaker2-1.12-4.1.20.574.jar | None |
| LC | ctgui | 1.0.0 | CraftTweaker2-1.12-4.1.20.574.jar | None |
| LC | jei | 4.15.0.291 | jei_1.12.2-4.15.0.291.jar | None |
| LC | crafttweakerjei | 2.0.3 | CraftTweaker2-1.12-4.1.20.574.jar | None |
| LC | orelib | 3.6.0.1 | OreLib-1.12.2-3.6.0.1.jar | 7a2128d395ad96ceb9d9030fbd41d035b435753a |
| LC | dsurround | 3.6.1.0 | DynamicSurroundings-1.12.2-3.6.1.0.jar | 7a2128d395ad96ceb9d9030fbd41d035b435753a |
| LC | elevatorid | 1.3.14 | ElevatorMod-1.12.2-1.3.14.jar | None |
| LC | explorercraft | 2.2.14 | Explorercraft-2.2.14.jar | None |
| LC | fastleafdecay | v14 | FastLeafDecay-v14.jar | None |
| LC | gravestone | 1.10.3 | gravestone-1.10.3.jar | None |
| LC | hardcorequesting | @Version@ | HQM-1.12-5.4.0-hotfix1.jar | None |
| LC | llibrary | 1.7.19 | llibrary-1.7.19-1.12.2.jar | b9f30a813bee3b9dd5652c460310cfcd54f6b7ec |
| LC | iceandfire | 1.9.1 | iceandfire-1.9.1-1.12.2.jar | None |
| LC | infernalmobs | 1.7.6 | InfernalMobs-1.12.2.jar | None |
| LC | inventorytweaks | 1.63+release.109.220f184 | InventoryTweaks-1.63.jar | 55d2cd4f5f0961410bf7b91ef6c6bf00a766dcbe |
| LC | ironbackpacks | 1.12.2-3.0.8-12 | IronBackpacks-1.12.2-3.0.8-12.jar | None |
| LC | ironchest | 1.12.2-7.0.67.844 | ironchest-1.12.2-7.0.72.847.jar | None |
| LC | journeymap | 1.12.2-5.7.1 | journeymap-1.12.2-5.7.1.jar | None |
| LC | libraryex | 1.1.3 | LibraryEx-1.12.2-1.1.3.jar | None |
| LC | lootbags | 2.5.8.5 | LootBags-1.12.2-2.5.8.5.jar | None |
| LC | mob_grinding_utils | 0.3.13 | MobGrindingUtils-0.3.13.jar | None |
| LC | mousetweaks | 2.10 | MouseTweaks-2.10-mc1.12.2.jar | None |
| LC | mowziesmobs | 1.5.5 | mowziesmobs-1.5.5.jar | None |
| LC | neat | 1.4-17 | Neat 1.4-17.jar | None |
| LC | netherex | 2.1.7 | NetherEx-1.12.2-2.1.7.jar | None |
| LC | roguelike | 1.8.0 | RoguelikeDungeons-1.12.2-1.8.0.jar | None |
| LC | worldedit | 6.1.10 | worldedit-forge-mc1.12.2-6.1.10-dist.jar | None |

Loaded coremods (and transformers): 

llibrary (llibrary-core-1.0.11-1.12.2.jar)
net.ilexiconn.llibrary.server.core.plugin.LLibraryTransformer
net.ilexiconn.llibrary.server.core.patcher.LLibraryRuntimePatcher
TransformLoader (DynamicSurroundings-1.12.2-3.6.1.0.jar)

Inventory Tweaks Coremod (InventoryTweaks-1.63.jar)
invtweaks.forge.asm.ContainerTransformer
iceandfire (iceandfire-1.9.1-1.12.2.jar)
com.github.alexthe666.iceandfire.patcher.IceAndFireRuntimePatcher
GL info: ' Vendor: 'Intel' Version: '4.3.0 - Build 20.19.15.4703' Renderer: 'Intel(R) HD Graphics 4400'

I just begun to have the same problem. I looked over my crash report and it is pretty much the same as yours (besides different mods). I have also tried it with the single mod. Hopefully, the issue can be found and fixed soon.

Your <minecraft folder>/config/avatar/stats.yml file is corrupted. Please delete it.