Crash when starting

[SkyBuff]

Here is the error I'm getting ---- Minecraft Crash Report ---- // Don't be sad, have a hug! <3

Time: 3/19/16 6:58 PM Description: There was a severe problem during mod loading that has caused the game to fail

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraftforge/common/ForgeChunkManager$LoadingCallback at cpw.mods.fml.common.LoadController.transition(LoadController.java:163) at cpw.mods.fml.common.Loader.loadMods(Loader.java:522) at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:206) at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:481) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:873) at net.minecraft.client.main.Main.main(SourceFile:148) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28) Caused by: java.lang.NoClassDefFoundError: net/minecraftforge/common/ForgeChunkManager$LoadingCallback at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:344) at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:440) 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:483) at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) at com.google.common.eventbus.EventBus.post(EventBus.java:275) at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:212) at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190) 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:483) at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74) at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47) at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322) at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304) at com.google.common.eventbus.EventBus.post(EventBus.java:275) at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:119) at cpw.mods.fml.common.Loader.loadMods(Loader.java:511) ... 10 more Caused by: java.lang.ClassNotFoundException: net.minecraftforge.common.ForgeChunkManager$LoadingCallback at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 35 more Caused by: java.lang.NullPointerException at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182) ... 37 more

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

-- System Details -- Details: Minecraft Version: 1.7.10 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_25, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 106538544 bytes (101 MB) / 224321536 bytes (213 MB) up to 1060372480 bytes (1011 MB) JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0 FML: MCP v9.05 FML v7.10.142.1104 5 mods loaded, 5 mods active mcp{9.05} Minecraft Coder Pack Unloaded->Constructed FML{7.10.142.1104} Forge Mod Loader Unloaded->Constructed AM2-Preloader{0.0.3} AMCore Unloaded->Constructed AnimationAPI{1.2.4} AnimationAPI Unloaded->Constructed arsmagica2{1.4.0.009} Ars Magica 2 Unloaded->Errored GL info: ' Vendor: 'ATI Technologies Inc.' Version: '4.5.13399 Compatibility Profile Context 15.201.1151.1008' Renderer: 'AMD Radeon HD 7900 Series' Any and all help would be very appreciated

[jjtParadox]

Next time, please use pastebin to post your logs here.

It appears you're using an old version of forge, please use forge build 1492 or newer.

[SkyBuff]

I believe I am using forge 1614 though

[jjtParadox]

Hmm they might have migrated or removed something AM2 uses... try using build 1492 and let us know if you have the same issue.

[SkyBuff]

Ok, I seem to have found my problem, It says in the crash report that am2.buffs.ArsMagicaPotion@eac698a @ 35 (ArsMagicaPotion & FreezePotion) are conflicting or something, how would I change this without having a config file for Ars Magica?

[jjtParadox]

You need to change the config file, which should be automatically created when Ars Magica is loaded. If it's giving you that crash report, then it should have at least created part a config file.

[SkyBuff]

So, I changed the config file but I can't figure out a item ID to give the item that is conflicting, any ideas?

[jjtParadox]

If you're using the latest version of Ars Magica, just delete the potion part of the config file and AM2 should try to re-create it with a non-conflicting potion. If that doesn't work, try setting it to a random 3 digit number.

[ThatOneTraitor]

@SkyBuff Any updates?