Error 20 in app store

Hello!
i have trouble in app store when i tried update GarageBand, Imovie, Iphoto (error 20 in App Store). Other application i can download and install without any problem. I search any solution for my question but is wasn't work. Please help me, i buy my mac mini in last Thursday and already i have problem
Sorry for my English.

Try repairing permissions.
Quit the App Store if it's open.
Launch Disk Utility located in HD > Applications > Utilities
Select the startup disk on the left then select the First Aid tab.
Click: Repair Disk Permissions
The processs can take several minutes. Quit Disk Utility when it's finished.
Launch the App Store and try updating your apps.
Your English is just fine !!

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g4rra
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Error 20 in app store

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