Write "Unknown error." Log in App Store from MacBook.

I cannot enter into AppStore only from MacBook, username and password is introduced correctly. Please, help me(

Try repairing permissions.

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Can I redownload the App Store from Macbook Pro

If I delete my App Store from my Macbook Pro will I be able to download it again in the future?

In addition to above;
Settings>General>Reset - Reset Home Screen Layout
will restore if there is no restriction set.

Could Not Sign In. An unknown error has occurred (App Store on iPad)

Hi,
I've just bought an iPad mini today. I have also created an Apple ID which is work fine with FaceTime and iMessage (already test call and sent text). But when I tried to login to App Store it said "Could Not Sign In. An unknown error has occurred". I tried login with my son's account and it work fine. It just won't accept my newly create ID. I'm sure my password is correct because I can use it to login to this Support Communities page.
What should I do?

Try refreshing the ID by signing out, restart the iPad and then sign in again..
Settings>iTunes & App Store>Apple ID. Tap your ID and sign out. Restart the iPad by holding down on the sleep button until the red slider appears and then slide to shut off. To power up hold the sleep button until the Apple logo appears and let go of the button.
Go back to Settings>iTunes & App Store>Sign in and then try to download again.

"Unknown Error" in the App Store on my iMac.

I get an "Unknown Error" when trying to purchase an app in the App Store on my iMac. I do not get this error in iTunes on the same Mac and using the same username/password or in the App Store on my iPad. Very frustrating. I've read some other threads and tried to delete the networkinterface.plist thing, but that didn't work either.

Google Earth is made by Google and they choose not to distribute their app that way. The App Store is convenient but by no means compulsory for developers.
EBay is a website, not an App.

Unknown error in Mac app store

Unknown error message at login for the Mac App Store Help!!!

Hi wjwyatt1,
Welcome to Apple Support Communities.
You may find some useful suggestions in these articles:
Mac App Store: "An unknown error occurred (100)" when purchasing
http://support.apple.com/kb/ts3637
Troubleshooting the Mac App Store
http://support.apple.com/kb/ts3624
Best,
Jeremy

"erro desconhecido" (Unknown error) login Mac App Store

I have a MBP (mac os x 10.6.8) and I would like to uprade to the new OS... but I'm having problems with my App Store.
I can't acess my acount, after a introduce my aplle ID and password I get the following message: (Unknown error)
Need some help here, please.

Hi wjwyatt1,
Welcome to Apple Support Communities.
You may find some useful suggestions in these articles:
Mac App Store: "An unknown error occurred (100)" when purchasing
http://support.apple.com/kb/ts3637
Troubleshooting the Mac App Store
http://support.apple.com/kb/ts3624
Best,
Jeremy

HT5631 How come App Store from MacBook Pro 13" wont accept my card?

I kept trying to buy an App. but app store wont just accept it? It's Mastercard, and i clicked mastercard. and yet it says "Please enter valid payment method information"

Is this a MasterCard credit or debit card issued by a bank, with a verifiable billing/statement address or is it a prepaid MasterCard debit card that you bought in a local store? Apple does not accept the second type of card.

Unknown error on mac app store

Cannot update or buy new apps on appstore - everytime have same error -
any suggestions??

HI..
I responded to you here > https://discussions.apple.com/thread/3927734?tstart=0

I can't log into App Store from my iPhone although I have entered the correct email and password.

Please help me out

If you are here to complain, you should know that we are just users like you.
If you are here to get help, we might be able to do that.
Can you give me your zip code where you are located and I can find what is called an Apple Specialist independent of Apple, but that normally has inside contacts, who can help you.
It is difficult for Apple to support iTunes related issues over the phone, though they are getting better at it.
Do you have an ipad 2?
If you have an ipad 2, does your Apple ID work with Facetime?
Let me know. This is for troubleshooting purposes.
Make sure you are entering the right e-mail address in addition to the password.
Does your Apple ID end in me.com or mac.com? Are you paying for MobileMe? If you have paid for MobileMe in the past, but aren't now, it's possible you may still have your MobileMe address as your Apple ID. If you are currently paying for MobileMe, you may be entitled to chat support.
What version of itunes are you running on your computer? What version of the ipad operating system? Are you jailbroken or not?

An unknown error has occurred app store

I have tried deletiing the networkpref file and still doesnt work.
Any ideas?

It is the networkinterfaces.plist you need to delete.
Dont forget to restart your computer after.

Why i can't download anything from the app store? (It turns up "Error en el App Store. Vuelve a intentarlo más tarde. (null)"

I am trying to download a game from the app store to my apple but it turns up "Error en el App Store. Vuelve a intentarlo más tarde. (null)".
I am trying to download any other thing from the store and i can´t.
I would like that somebody could tell me if it is a problem of my computer or if it is an apple problem , and if i can do something to solve the problem.

That cryptic error message might mean that the payment information in your account is invalid. Check with your credit-card issuer to see whether a charge was denied. If not, see below.
Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Please take this step regardless of the results of Step 1.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.

I cannot sign into App Store. "unknown error" and then "We cannot complete your request. There has been an error in the App Store. Please try again later. (4)"

I cannot sign in to the App Store.
I changed countries a few months ago and updated all my account info and everything was working fine, until recently, while trying to upgrade my softwear to Mavericks, which I cannot do. My apple Username and password work fine on iTunes and on my iPhone. I can also access all my account info when I sign in through the website. It just will not work for the App Store on my Mac Pro.
When I click "Welcome" under Quick Links it asks me to sign in. I sign in with my Apple Username and Password and then it DOES NOTHING
When I click on "Free Upgrade" and then "Install" on the mavericks software, it asks me to sign in again. This time it says "unknown error" and then it says "We cannot complete your request. There has been an error in the App Store. Please try again later. (4)"
I''m completely blocked. I cannot procede without being able to update my software.
Please help me.
Rhea

You could try this.
Back up all data.Triple-click anywhere in the line below on this page to select it:
/Library/Preferences/SystemConfiguration/NetworkInterfaces.plist
Right-click or control-click the line and select
Services ▹ Reveal
from the contextual menu.* A folder should open with an item selected. Move the selected item to the Trash. You may be prompted for your administrator login password. Reboot and test. If there's no change, restore the item you deleted from a backup, overwriting the one that may have been created in its place. Otherwise, you may need to recreate some of your settings in the Network preference pane.
*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, paste into the box that opens (command-V). You won't see what you pasted because a line break is included. Press return.
Credit for this solution to ASC member luis.pinhor.

Why am I receiving an unknown error message when try to upgrade OS 10.8 to Yosemite? It also says "There was an error in the App Store. Please try again later (4)."

Why am I receiving an "unknown error message" when I attempt to upgrade my X OS from 10.8 to Yosemite? It says "There was an error in the App Store. Please try again later (4)." This happens only when I check for updates/upgrades for my software and then try to upgrade Yosemite in the App Store. Thanks for any help!

Hi.
I'm having the same problem. Could you tell me how you resolved it.
Thanks
Aliquatpat.

HT1725 Why cant download from apple store? "There was an error in the App Store. Please try again later. (100)"

Why cant i download application from apple store, they said :There was an error in the App Store. Please try again later. (100) and they suggest : Contact iTunes Support at http://www.apple.com/uk/support/itunes/ for assistance. pls help me

Why cant i download application from apple store, they said :There was an error in the App Store. Please try again later. (100) and they suggest : Contact iTunes Support at http://www.apple.com/uk/support/itunes/ for assistance. pls help me

I cannot to download from the mac app store (There was an error in the App Store. Please try again later. (20))

I cannot to download from the mac app store (There was an error in the App Store. Please try again later. (20))
I traied to remove cookies and still don't working.

Regretably, none of the above solutions has resolved this problem for me.
Whenever I try to perform updates (in my case, Xcode and iPhoto both want to update), I receive the following error:
An error occurred during purchase.
(of course, I am not trying to purchase anything, it is a free update)
If I press Retry, the above repeats until I press Cancel, then I see:
We could not complete your request.
There was an error in the App Store. Please try again later. (20)
I have been "trying again later" for three weeks now, with no resolution in sight.

Write "Unknown error." Log in App Store from MacBook.

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