Most of the chat colors such as Aqua, silver, and more do not work. I also get this exception in Console: 

IndexOutOfRangeException: Index was outside the bounds of the array.

Okay got my answer on chat colors. Still not about the exception which spams the console

When does exception occure? This is an error, which might be coming from everywhere, so there is not much details really.

It was fixed after i update oxide & steam once again.

Rust no longer supports color names, only hex codes.