Error when starting up gmod

Hello,I tried to start up gmod,and it instantly closes,and this error shows up :

“SteamStartup() failed: SteamStartup(0xf,0x0014E260) failed with error 1: failed to take master pipe connection lock”

Can anyone help me please?

I am bumping this,since my exemplary of garry’s mod seems to be scripted by a russian,so it still continues to NOT WORK after reinstalling it.

restart steam

Solution for everything
Is that doesn’t work, angrily mash Ctrl-Alt Delete
if that doesn’t work, your screwed

Garry it’s important you read my PM

  • Try delete the ClientRegistry.blob
  • Gmod>Properties>Local Files> Verify Integrity of Game Cache
  • Verify your Firewall (disable / add to exceptions)