my game froze while i was downloading something and idk how to fix it

my game just crashed after i downloaded a texture pack for iMac
the game to just normally load w the texture pack
no glitches what so ever just normal logging in

my game froze and then crashed
" " " " " "

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...download fantsypvp
3. ...and then if it doesn't work then try downloading more texture packs such as miners,tree craft,and etc