How do I get rid of error 20 in the App store? for garage band.

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How do I get rid of error 20 in the App store? for garage band.

I have an iMac 21.5 inch late 2013 and do my updates as requested.

I updated everything, but I get an error 20 message, which is "can't be updated due to error in the app store" I can't seem to figure out how to get rid of that message. Tried shutting it down, still can't get that error 20 message to go away. Can someone help?

Processor 2.7 GHz, intel core i5

Memory 8 GB 1600 MHz DDR3

Graphics Intel Iris Pro 1024MB

Serial Number D25LQ0WKF8J2

Software OS X 10.9.5 (13F1096)

iMac (21.5-inch, Late 2013), OS X Mavericks (10.9.5)

Posted on Aug 5, 2015 5:45 PM