My macbook keeps coming up with error 20 when I try to download updates from the app store. How do I rectify this?

When I try to download updates for programmes like pages and imovie my moacbook keeps coming up with error 20 and asks me to try again later. Is there a way to solve this problem?

Try This...
Close All Open Apps...  Sign Out of your Acount... Perform a Reset... Try again...
Reset  ( No Data will be Lost )
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.
http://support.apple.com/kb/ht1430

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