Cant login to App Store "This is not a Test User account"

System:
2013 Macbook Air
OSX 10.8.5
Today I wanted to login to the app store app, to update my OS.
When I log in I get a dialog box that states:
This is not a Test User account.
Please create a new account in the Sandbox
environment. [Environment Sandbox]
                                         [    OK    ]
If I try different Apple ID's the result is the same.
Why is this happening?
How can I fix this?

Log out of the App Store. From the App Store menu bar click Store > Sign Out
Now click your Apple menu  (top left corner of your screen)
From the drop down menu click Software Update.

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