Minecraft Crash Help?-Collection of common programming errors
- more pistons is incompatible with one of the others. so unless you want to re make the mod or you could find out which mod is incompatible and remove it but it might break your saves if you do
you’ll have to get rid of it if you can’t find a way around it
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I doubt you would have missed this having installed so many mods, but did you forget to delete the META_INF File? If not maybe you should check to make sure they are all compatible with each other.