Ars Magica on Ultimate Pack

[Licki200]

I have been trying to install ars magica on my ultimate pack v.1.0.1 but keep getting this error. Please help!

Minecraft has crashed!
----------------------
Minecraft has stopped running because it encountered a problem; Failed to start game
A full error report has been saved to C:\Users\Jacob\Desktop\Ultimate\minecraft\crash-reports\crash-2013-04-30_19.09.40-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash

java.lang.IllegalArgumentException: Parse error
at com.eloraam.redpower.core.TagFile.readtag(TagFile.java:249)
at com.eloraam.redpower.core.TagFile.readtag(TagFile.java:261)
at com.eloraam.redpower.core.TagFile.readtag(TagFile.java:261)
at com.eloraam.redpower.core.TagFile.readStream(TagFile.java:309)
at com.eloraam.redpower.core.TagFile.readFile(TagFile.java:288)
at com.eloraam.redpower.core.Config.loadConfig(Config.java:31)
at com.eloraam.redpower.RedPowerCore.preInit(RedPowerCore.java:37)
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 cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:487)
at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
at com.google.common.eventbus.EventBus.post(EventBus.java:268)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:153)
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 com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
at com.google.common.eventbus.EventBus.post(EventBus.java:268)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:86)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:505)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:161)
at net.minecraft.client.Minecraft.a(Minecraft.java:412)
at asq.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(Minecraft.java:746)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 6a76a5cd ----------[DOUBLEPOST=1367363532][/DOUBLEPOST]Here is the needed file

 

[Virgoddess]

I believe that's an ID conflict. Check the IDs for Redpower and Ars Magica and change the one(s) that are the same.