Garrys mod not starting up mac

my Garrys mod is having an eternal starting up problem. When i press command tab Garrys mod it not there, I’ve watched vids yet they did not help. i have Software OS X 10.9 on my mac and i think it maverixs if i go on a different desktop on my computer i see a: Engine Error failed to read 1858954 bytes how can i fix this please help me! I have tried restarting my computer that did not work i have Skype my username for Skype is : extremesdb1 . help me please!

What is your VRAM( Video Card ) and RAM sizes?

Graphics NVIDIA GeForce 8800 GS 512 MB
Ram 4 GB 800 MHz DDR2 SDRAM

[editline]1st September 2014[/editline]

hello u hear robot boy?

Seems like your system fails to get some memory or something.

do u know what i could do?

[editline]1st September 2014[/editline]

i really want to play g mod again

[editline]1st September 2014[/editline]

this i my memory it says Memory 4 GB 800 MHz DDR2 SDRAM

is there anything can do? I’m sad i cant do anything about it! I really want to play it soooo back can someone help i am in need of help! help me I’ve had 120 people look at this and yet none help me on how to fix this! D: