All modpacks crash upon opening.

[the rabid rabit]

So I've been playing attack of the B team using the technic launcher for a while now and never encountered any problems. Recently however every time I attempt to start up any modpack it crashes. I get a long crash report with which I don't know what to do. I am playing on Mac and have tried fixing it using some things the mods posted but none of the solutions have worked. I can post the crash report if needed, please help I have no clue what is wrong.