Okay, I'm genuinely wondering why this keeps crashing. I'm attempting to connect a Thermal Expansion Leadstone Energy Conduit, to a forestry Centrifuge. The crash doesn't happen when I connect the conduit, but rather when I attempt to interact with the Centrifuge after the conduit connects.
Pastebin to crashlog: http://pastebin.com/i2kiuQSJ
Also, while it states Optifine is the problem, I experience this crash without Optifine as well.