Failed to start game (unknown error)

[KOT9KA]

When I try to run Rust experimental version I get message "Failed to start game (unknown error)".

[eac knubbe]

Do you get this error from Steam or as separate message box (non-steam)?

[KOT9KA]

[QUOTE=eac knubbe;45473657]Do you get this error from Steam or as separate message box (non-steam)?[/QUOTE]
I get this message from Steam.

[KOT9KA]

I need to contact Steam support?

[IndigoSolace]

I get this error window from Steam as well. When I run the exe from the folder, the game starts fine. It only runs for a minute before EAC boots me for bypassing though.