Initialization error on ModLoader and clearing the cache

[hrodruck]

I am using the latest Tekkit Classic Build (3.1.3) and, as I start it, I get the following error regarding ModLoader. I've searched for answers in forums, but none were marked as solved. Some advice I could gather was to clear the cache (I am ashamed of this, but I can't find how to to that) or stop using modloader, which I also don't know how to do. Thank you.

 

java.lang.NullPointerException
	at cpw.mods.fml.common.modloader.ModLoaderModContainer.init(ModLoaderModContainer.java:356)
	at cpw.mods.fml.common.Loader.modInit(Loader.java:273)
	at cpw.mods.fml.common.Loader.initializeMods(Loader.java:628)
	at cpw.mods.fml.client.FMLClientHandler.onLoadComplete(FMLClientHandler.java:223)
	at net.minecraft.client.Minecraft.a(Minecraft.java:429)
	at net.minecraft.client.Minecraft.run(Minecraft.java:738)
	at java.lang.Thread.run(Unknown Source)

 

[Munaus]

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