I can't start Garry's mod server

I downloaded the server via steamcmd and when i start the server i get error message…

“The procedure entry point (?Pop@CValidator@@QAEXXZ) could not be located in the dynamic link library tier0.dll”

I click to ok and i get another error

“Failed to load the launcher DLL:
The specified procedure could not be found”

I try everything what i found in google but nothing.