Minecraft Forums

So basically I tried to install the DragonBlock C mod for minecraft. I went through several tutorials on how to install it, followed it exactly, did both Manual and quick installation and neither worked. Minecraft wont even start I just get to the mojang screen and then instantly get this error report:

java.lang.NoClassDefFoundError: JinRyuu/JRMCore/JRMCoreKeyHandler
at JinRyuu.DragonBC.common.DBCClientTickHandler.onTickInGUI(DBCClientTickHandler.java:287)
at JinRyuu.DragonBC.common.DBCClientTickHandler.tickEnd(DBCClientTickHandler.java:69)
at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:34)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:141)
at cpw.mods.fml.common.FMLCommonHandler.onPostClientTick(FMLCommonHandler.java:367)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1970)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:910)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
at net.minecraft.client.main.Main.main(SourceFile:101)
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.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
Caused by: java.lang.ClassNotFoundException: JinRyuu.JRMCore.JRMCoreKeyHandler
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 15 more
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:178)
... 17 more

Not sure how to link it seeing as its a giant column of text that I cannot post because its too long so...Email it? Lol I have no idea

I have the same error so can someone help me out