Buildcraft version: 7.99.7
Forge version: Latest 1.11.2 Beta
Link to crashreport or log (on pastebin or gist, please don't put the entire log here) :
Singleplayer/multiplayer: SinglePlayer

Additional information:

I can't power buildcraft machines like Quarry with RF. In the past this was possible.

duplicate of #3760

this was indeed possible in the past but since we have moved back towards MJ as powersystem