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Im trying to make a modpack, but it keeps crashing saying,

The game crashed whilst initializing game
Error: java.lang.RuntimeException: Invalid id 4096 - maximum id range exceeded.

the entire entire crash report says

---- Minecraft Crash Report -------- Minecraft Crash Report ----
WARNING: coremods are present: Wizardry Plugin (wizardry-0.9.7.jar) llibrary (llibrary-core-1.0.10-1.12.2.jar) EnderCorePlugin (EnderCore-1.12.2-0.5.43.jar) OTGCorePlugin (OTG-Core.jar) LibrarianLib Plugin (librarianlib-1.12.2-4.15.jar) AstralCore (astralsorcery-1.12.2-1.10.7.jar) AdvancedRocketryPlugin (AdvancedRocketry-1.12.2-1.4.1-118-universal.jar) DCLoadingPlugin (DummyCoreUnofficial-2.4.112.5.jar) TransformerLoader (OpenComputers-MC1.12.2-1.7.3.146.jar) ForgelinPlugin (Forgelin-1.8.2.jar) CTMCorePlugin (CTM-MC1.12.2-0.3.3.22.jar) HCASM (HammerCore-1.12.2-2.0.4.1.jar)Contact their authors BEFORE contacting forge
// My bad.
Time: 12/27/18 5:06 PMDescription: Initializing game
java.lang.RuntimeException: Invalid id 4096 - maximum id range exceeded. at net.minecraftforge.registries.ForgeRegistry.add(ForgeRegistry.java:295) at net.minecraftforge.registries.ForgeRegistry.add(ForgeRegistry.java:281) at net.minecraftforge.registries.ForgeRegistry.register(ForgeRegistry.java:113) at com.blakebr0.cucumber.registry.ModRegistry.registerBlocks(ModRegistry.java:230) at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_610_ModRegistry_registerBlocks_Register.invoke(.dynamic) at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) at net.minecraftforge.fml.common.eventhandler.EventBus$1.invoke(EventBus.java:144) at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182) at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:775) at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:628) 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:---------------------------------------------------------------------------------------
-- Head --Thread: Client threadStacktrace: at net.minecraftforge.registries.ForgeRegistry.add(ForgeRegistry.java:295) at net.minecraftforge.registries.ForgeRegistry.add(ForgeRegistry.java:281) at net.minecraftforge.registries.ForgeRegistry.register(ForgeRegistry.java:113) at com.blakebr0.cucumber.registry.ModRegistry.registerBlocks(ModRegistry.java:230) at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_610_ModRegistry_registerBlocks_Register.invoke(.dynamic) at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90) at net.minecraftforge.fml.common.eventhandler.EventBus$1.invoke(EventBus.java:144) at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182) at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:775) at net.minecraftforge.fml.common.Loader.preinitializeMods(Loader.java:628) at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:252) at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:467)
-- Initialization --Details:Stacktrace: 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)
-- 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: 4391461720 bytes (4188 MB) / 5998903296 bytes (5721 MB) up to 5998903296 bytes (5721 MB) JVM Flags: 4 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx6144m -Xms6144m -XX:PermSize=6144m IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0 FML: MCP 9.42 Powered by Forge 14.23.5.2796 161 mods loaded, 161 mods active States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

I'm no expert but the line

id 4096 - maximum id range exceeded.

seems to suggest that you've got mods installed that has somehow exeeded the maximum available number of id's..

In older Minecraft IIRC this was due to items/block etc were given a number instead of a name (eg was '0' stone = '1' etc) but since 'forge' is mentioned I suspect Forge can only handle a maximum of 4096 id's.

Googling this problem I found on a post to an old mod & found this reply that seems to support my guesswork

Forge only lets you use 4096 different blocks, and your modpack is trying to use too many. XNet just happens to be what's crashing because
it's at the end of the list alphabetically, so all the earlier mods got their blocks before it ran out. To fix it, either remove some mods that are using too many blocks, or install NotEnoughIDs.

You don't seem to have a full crash report above as I cannont see any mods listed.. without that I guess noone can take a guess as to what mod may the main culprit