GMod Crashes on Mac OS X. HELP GUYS!!!!!!!! newbie player :( cant even play GMoD Waaah!!

GMoD Crashes on OS X! half way though the load screen it crashes and says “hl2_osx quit unexpectedly.”
“Click Reopen to open the application again.” idk why it does this shit, this is my first time playing GMoD 2… :(. Oh and I opened it up before and it played fine! But I remember doing some update on steam. HMU @FlexGamingPro, or on this thread. PLEASE HELP! thanks!