we could not complete your request. there was an error in the app store. please try again later. (20)

Hi all,

i am getting the below message when trying to download the imove and iphoto update from the app store app on my mac book.

I am able to download this on my imac with the same apple id and password, but when i try to do this on my mac book i get the following messsage:

we could not complete your request. there was an error in the app store. please try again later. (20)

this is strange as my account allows me to download other puschases on this macbook, and i have full admin rights on the macbook.

Cheers

Georgie