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minecraft forge 9.10.842 crashes and 9.10.840 doesnt (mod's compatibility broken

thecow275
in Support & Bug Reports

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1) Use the spoiler tags -.-

2)

2013-08-23 17:36:08  [sTDOUT] java.lang.RuntimeException: Tried to recreate an item id (31743 / shifted:31999) for an item which already exists as ic2.core.item.ItemRadioactive@12452c3. Check your config and resolve the conflict.

Item ID conflict, nothing to do with Forge.

I do Forge for free, however the servers to run it arn't free, so anything is appreciated.
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