I cannot download any application from my app. store it gives me error 13

When ever I want to download an application on my Macbook pro, It gives me an Error (13) and  I cant download anything

First take the steps recommended in this support article. If there's no change, continue as follows.
Back up all data.
Triple-click anywhere in the line below on this page to select it:
~/Library/Cookies/com.apple.appstore.cookies
Right-click or control-click the line and select
          Services ▹ Reveal in Finder (or just Reveal)
from the contextual menu.* A folder should open with an item selected. Quit the application if it's running. Move the selected item to the Trash. Relaunch the application and test.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination  command-C. In the Finder, select
          Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return.

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