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Sorry for this late reply, but for me it works now.
Downloaded the newer version of IC² today and downgrade forge from 3.1.2.94 to 3.1.2.90 make it happen.
Maybe the problem is more forge the IC² and buildcraft.
Greatz
Mo3pp3l
That didn't really work.
Fixed. I had to delete my entire .minecraft and reload all over again.