Constant Crashing [Mac]

Everytime I attempt to connect, I get a crash and everything fails. I have tried resetting my computer, my gmod, uninstalling/ reinstalling, and removing all of the Gmod Folder.

System Specs:

Model Name: iMac
Model Identifier: iMac11,1
Processor Name: Intel Core i7
Processor Speed: 2.8 GHz
Number Of Processors: 1
Total Number Of Cores: 4
L2 Cache (per core): 256 KB
L3 Cache: 8 MB
Memory: 4 GB
Processor Interconnect Speed: 4.8 GT/s
Boot ROM Version: IM111.0034.B02
SMC Version (system): 1.54f36
Serial Number (system): W80061BN5RU
Hardware UUID: FC8CE4AC-9E4E-5AEB-8849-D588D9FC1123

Help Please.

(I have the crash report if you need it.)