thanks so much, it worked like a charm, BTW i had to use an alternate launcher because avira said it was a virus and i accidentally clicked remove and i had to reinstall minecraft but it didn't work so i used that.the key early lines:
fluxed crystal crash looks like the custom resource seed crystals got messed up this happend beforeInitializing game
java.lang.IllegalStateException: Not a JSON Object: "\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000"
the known fix for this issue(copied from caigans github minus the link)
java.lang.IllegalStateException: Not a JSON Object
This is a rare bug that happens with Fluxed Crystals 2. To fix it, you'll need to change to the backup seed data files.
Refer to (caigans github) on how to find your config folder if you don't know how.
In the /config/fluxedCrystals/ folder, there is a /backup/ folder. Copy the three files in it, and paste them back in the /fluxedCrystals/ folder, overwriting the old copies.