Launcher crashes when optifine is used

[KVO]

I added optifine to my Tekxit pack (same version) and now every time I try to launch, it crashes mid-launch.  I've tried reeinstalling but it didn't fix anything.     Here's one of the crash logs: https://pastebin.com/f3yhS560.   Any help would be appreciated because I can't run the modpack well without optifne.

Oops didn't realize this was the wrong thread and can't find how to delete.  Sorry

[JaariAtmc]

Do not add Optifine to a 1.7.10 modpack that contains Fastcraft, as you get this crash.