Engine Error

Today I installed some addons I had (my computer was reset so I had to install all again). After installing them, I opened GarrysMod and this comes up:

Engine error
Client.ddl Init() in librar client failed

Yes, I had original Garrys Mod.

valve update, wait for garry to fix

and please look at the other threads in this section

Yeah I found them later. Thanks for the reply.