bax is right about the Avid forum. This link, just a bit more specific, is for the Media Composer/Mac forum:
Check hardware specs for MC6, to see if your Mac meets them. Check also your OS, and QuickTime versions for compatibility with MC6 (by the way, there's an update to 66.0.1 I think it iswhich solves some bugs).
There are Mac/Avid users on this forum who will help if it's anything complicated as well.
I already figured it out thank you guys and for anybody else that needs help with this situation here was my solution ------> go to your Macintosh HD folder -> rightclick system folder -> get info -> last tab sharing and permission unlock the little lock -> change all except everyone to read and write . and it should work with no issue