No worries! Maybe we can try something else.
Disclaimer: Please check the script below carefully and always understand what code you are running and why. The purpose of the script shown below is to help you verify the integrity of the file -> dll_streets.vpk.
Okay now that that's out the way...
It seems some of the content files have been corrupted. Usually verifying the integrity of the files will result in fixing the corrupted files. Have you verified the integrity of the game files through Steam? Go to Library > Home > Right click on Deadlock > Properties... > Installed Files >...