Unknown Error in App Store

I have a 2012 Mac Mini. I downloaded Mavericks last week after the release. I have not been able to download an app off the app store since downloading Mavericks. I recieve the message unknown error. Any suggestions?

If you haven't already done so, sign out of the App Store and sign back in. If there's no change, log out or restart the computer and try again.

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Here is a step-by-step of what worked for me:
Create a new user account - let's name it "Test" - I did not make this an administrator account
Log into that new user account (skipping the AppleID/iCloud screen)
Select "Software Update…" from the Apple menu - you will be asked to enter an administrator name and password in or to check for system updates - just provide your normal (admin-enabled) user name and password
If you have any updates available, click "Update All" and log into the AppStore with your normal AppleID/password (this should work since you are in a new user account)
(If you don't have any updates available, I assume that you can also log in using the menu item in the Store menu of the AppStore application though I have not tried that)
As soon as the download starts, you can quite the AppStore application
Log out of your test account and back into your normal account
Open /Applications/Utilies/Terminal
Type the following command:
sudo cp /Users/test/Library/Cookies/com.apple.appstore.plist Library/Cookies/
Open the AppStore again and you should be able to log back in
What does this do? It seems that the com.apple.appstore.plist file in your normal user account has become corrupted - we use a new account and create a new one (which is interchangebale since we use the same AppleID) and move that one back to the main account with the corrupt file.
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I can't download Mountain Lion. Get unknown error from app store.

Has anyone else had this problem? I'm using OS Lion now. Have updated all my apps. Looks like everything is cleared to go.
When I click "download" from the app store, I get an error. Says unknown error. Try again later.

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Unknown error in App Store Cannot download updates.

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If you haven't already done so, sign out of the App Store and sign back in. If there's no change, log out or restart the computer and try again.

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I have the same error "XXXX App cannot be opened because of a problem". And I also cannot open iTunes and get the error "This copy of iTunes is corrupted or is not installed correctly. Please reinstall iTunes."
Only Apple apps seem to be at issue here...
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Message was edited by: [email protected]

I got my daughter a brand new Ipod today and was forced to download ITunes V8, and ran into this error. I have spent the better part of christmas trying to get this to work without luck. I have renamed the host file, cleared dns, updated my firewall to assure that itunes is clear to communicate, assured that I don't have proxy server set, etc. I had Version 7 and never had any problems. This thing doesn't do me much good if I cannot purchase music, and it seems this problem has been going on for a while since I see posting from October. I can access any website that I want outside the Itunes application, so it isn't my web connection....any thoughts.

Se produjo un error en App Store. Vuelve a intentar más tarde. (100)

Que puedo hacer con este error?
No me permite realizar descargas.
Se produjo un error en App Store. Vuelve a intentar más tarde. (100)
Gracias

tengo el mismo problema, alguien que me ayude

I cannot update my system, error in app store

I cannot update system to mountain lion, 'an error in app store, please try again. (13)'

Try deleting the cache, cookies, and preferences associated with the App Store.
Quit the App Store if it's open.
Open the Finder. From the Finder menu bar click Go > Go to Folder
Type this exactly as you see it here:
~/Library/Caches/com.apple.appstore/Cache.db
Click Go
Move the Cache.db file to the Trash.
Now here:
~/Library/Preferences
Click Go
Move these files from the Preferences folder to the Trash.
com.apple.appstore.plist
com.apple.storeagent.pllist
Now here:
~/Library/Cookies
Click Go
Move the com.apple.appstore.plist file from the Cookies folder to the Trash.
Empty the Trash, try the App Store.
If you continue to have problems, if you have anti virus software installed, disable that before trying to upgrade.
And try turning off the Firewall in System Preferences > Security (or Security & Privacy) > Firewall

Hello I get an error.in app store

Hello I get an error.in app store.
"we could complete your request.
there was an error in the app store.please try agian later. 13"

Follow the paths and move the files in bold print to the Trash.
~/Library/Caches/com.apple.appstore/Cache.db
~/Library/Preferences/com.apple.appstore.plist
~/Library/Cookies/com.apple.appstore.plist
/Library/Preferences/System Configuration/Network.interfaces.plist
~ (Tilde) character represents the Home folder.
For Lion: To find the Home folder in OS X Lion, open the Finder, hold the Option key, and choose Go > Library
See if that helped.

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Hello,
I've just bought a new iPhone 5 16gb from Carphone Warehouse.
I put SIM in, create a new account using icloud.com
When I try and log in to app store (the first thing I do after installation) it says "Account already in use".
When I log in using the credentials it says "Could not sign in - an unknown error has occured".
I then reset phone and tried again using existing email.
Same problem.
I'm getting so frustrated!
Please help.

Thanks for the tip. However it did not work. The only thing that I hadn't tried out of that list was turning imessage off and back on. When it prompted for my password it said it was wrong, then turned on anyway. Still I can't add my apple id. Same as before.

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If you click sign out on store it won't let you sign back in. It give same unknown error. It's gotta be ITunes since log-in info works here.

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Files appear to download entire MB download and then fail to install, requiring a complete re-start of download from the beginning. This is *expensive* when you have a limited monthly download cap.
Is there any way to find the previously downloaded file within OSX Mavericks and to resume it rather than having to redownload the whole file (with the possibility of getting another error message at the end (this has happen twice now!
Any help much appreciated.

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Try here > Mac App Store: How to resume interrupted downloads

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Hello,
I'm working in a radio company and I installed iTunes 7 in my pc but doesn't work correctly.
I have a problem in my iTunes Store: "unknown error -50".
Therefore I can't buy anything in the store.
The search is ok!
At home everything is ok.
Where can I check my network settings ?
Any solutions ?
Thanks!
Dell Pentium D Windows XP

Here the solution from our experts of Information Technology:
Configure the proxy to bypass SSL interception for this URL: "phobos.apple.com "
And now it's working 100% !
Many thanks to Corrado !
Dell Pentium D Windows XP Pro

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