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Seems you're having too many dimensions. You can't go past dimension 128 unless you upgrade forge to a version that can handle this. This is not a bug in rftools but in Minecraft and recent versions of forge have solutions for that.
Actually it turns out it *was* a bug in rftools after all but you still need a very recent version of Forge. In RFTools 2.93 this bug is fixed and you can have as many dimensions as you want.