Cant disable Mystcraft instabilty without crashing?

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Code:
2012-11-19 21:33:54 [SEVERE] Encountered an unexpected exception IllegalArgumentException
java.lang.IllegalArgumentException: Slot 204 is already occupied by xcompwiz.mystcraft.BlockStarFissure@7ac0e5f9 when adding portalgun.common.block.BlockPortalMod@e3a7d65

Well there's your problem. You got an ID conflict.
 
Its not that, because it works fine when on true. Turn it to false and you get that like stated above.

Anyhow i have fixed it. Was down to how the file is read by the FTB modpack got nothing to do with ID conflicts its a simply change and now it works.
 
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Yes and no, its down to how the .txt file is read you change that then the issue is resolved i now have it on false and no crashing.