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java.lang.IllegalArgumentException: resource AM2_at.cfg not found. #1429
I've been getting this on my server since 008.
[09:18:55 ERROR]: A critical problem occurred registering the ASM transformer class am2.preloader.AccessTransformers
This is a duplicate bug report - we're aware of the issue and it's caused by defining an access transformer as a requirement (incorrectly), but not including it in the jar (correctly, as we don't need one!).
This is only console spam and won't have a negative effect on your ability to play the mod (no crashes or problems of any sort). It will be fixed for sure in the 1.8 update, but I can't say for sure regarding 1.7.10.