Are you receiving this error when trying to play your television?
If so, here's how you can fix it.
In order to fix this you must have your game closed, then you will need to open steam, navigate to your library, right click Garry's mod and go to properties.
Then navigate to "Betas"
Then, apply "x86-64 - Chromium + 64-bit binaries"
After having done this, let Garry's mod update, then you can launch your game and join the server.
The game uses chromium instead of awesomium to render HTML objects, Chromium is pretty much better in every way, speed, stability, and security.
It also allows the game to run i 64-bit which nearly doubles your performance, so it is highly recommended.