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Couldn't execute command: gnome-screensaver-command --lock Verify that this is a valid command

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http://askubuntu.com – I'm using Ubuntu 11.10 and a very novice user. From today, I'm suddenly experiencing this problem. If I press Ctrl+Alt+L to lock the PC, I find the following error message Couldn't execute command: gnome-screensaver-command --lock Verify that this is a valid command and PC doesn't get locked. If I try to lock from menu item "Lock Screen" in the power button at the top right corner of the screen, nothing happens. Yesterday I updated and upgraded the OS. I think this is the first time I'm trying to lock the PC after update. What's going on? How to fix this? (HowTos)