running cs source problem in linux

[janlou]

Hi, Sorry for my bad English
How can i fix this error?
After running ./srcds_run file:

Code:

Unknown command "s"
Unknown command "ementt"
Unknown command "stuff"
Unknown command "/"
Unknown command "stuffcmdstuffcmds"
Unknown command "s"
Unknown command "cmds"
Unknown command "cmdcmds"
Unknown command "cmds"

The server does not work, and when I use the command (changelevel de_dust) it says: can't change level server not running.
Ubuntu version: 16.04