Sign in to (null) to update applications for that account.

Hi,

Quit the Mac App Store if it's open. From the menu bar App Store / Quit App Store. Or Command + Q on your keyboard.

Launch iTunes then from the iTunes menu bar click iTunes / Preferences then select the Advanced tab.






Click: *Reset warnings and Reset cache*.



 Now from the iTunes menu bar click Store / Sign Out.



Try the Mac App Store.

If you still have problems, follow the paths here. 



~ (Tilde) represents your Home folder.

~/Library/Caches/com.apple.appstore/Cache.db. Move the Cache.db file to the Trash.



~/Library/Preferences. Move the com.apple.appstore.plist and com.apple.storeagent.plist files to the Trash.



~/Library/Cookies. Move the com.apple.appstore.plist and Cookies.plist files to the Trash.



Restart your Mac. 

Relaunch the MAS. If you still see the notification, email the MAS Customer Support here.

Please click My Settings on the right side of this window and update your forum profile. Thanks!

One other thing to check. From the iTunes menu bar click Store / View My Account. Make sure your payment information is correct.




























Carolyn 🙂

Message was edited by: Carolyn

Hi,

I have the same problem and tried deleting the plist. etc. but it didn't work.

Which App did you delete and redownload? The "Mac App Store"-App or a specific App in the App Store which causes the problem, when updating?
And if your answer is the "Mac App Store"-App, then tell me, how to reinstall it. I got it only from the 10.6.6 Update.

Carolyn

Your method does not work for me.

I tried that.

Cannot work.

Thanks, that worked for me!

Deleting the offending app (Facetime) worked for me. I noticed that I had to authenticate as an admin user before the app could be moved to the trash. I can't recall doing this but perhaps I downloaded it when I was logged into the computer with another admin user and hence I would not have privileges to replace the app. The Mac App application was then not able to function (I presume it deletes and replaces the app) but was really giving an incorrect message. It may have been trying to tell me to login as a different user on the mac rather than a different itunes account.

I have the same problem but it is for all programs not just the facetime.

It works by deleting the application, but it doesn't solve the problem because it happens next time when a new app needs updating. So in the long run deleting is not the solution.

I think multiple user accounts is the problem. FaceTime was the one app I'd installed when logged into a separate user account, and it was the one app I had this "(null)" issue with.

Deleted, reinstalled from my main account, and I suspect that will be the end of it.

Having the same problems as the OP here... Only one account on Mac. None of the 'fixes' work (logging out in itunes, removing .plist etc).

Deleting app and reinstalling isn't a fix, it's a poor workaround. I'm not doing that and losing data for loads of apps just to get an update to work!

MaFt

Is there no other solution to the account problem? I am having the same issue updating Courier and would really like to avoid having to delete the app and lose all of my envelopes and destinations I have saved just to update.

This is the third time updating on the App store has done this. The other 2 times deleting the apps wasn't a big deal because they didn't involve saved information. This is a major con to the app store and making me fondly remember getting updates from individual developers.

Just trashing Courier will not delete all your settings/envelopes.
I tried it and all my envelopes where still there.
Those settings are stored in your Preferences folder.

I had to log into another account used for TS to get the update.

Thanks ... Ken

Well, I guess I'll give it a shot, but just regular trash and not Appdelete which would clean out the preferences too.

I already tried updating from my wife's account and my TS account with no success.

Thanks.

EDIT: deleting and reinstalling worked and my envelopes are fine. Thanks for the help.

Message was edited by: mjconn75

Thanks guys. Deleting Facetime 1.01 (or whatever it was before the new full-screen update) in Finder, reopening App Store, reviewing My Purchases tab and clicking INSTALL worked. It scared me when I visited the Facetime app link from the Featured tab and it said to BUY!

This doesn't work with Xcode !!

I tried to trash the full Developer folder (yes !) and end up with still that silly Update button !!

1 - Which file should I delete to make MAS see that Xcode is not present ?!
2 - Avery app I purchased in MAS has the same issue. Is there a real fix for this ?

I've had this from day 1 of the Mac App Store on my iMac although everything works fine on my MBP. 10.6.7 only changed the (null) part of the error message. But I've now got it working...

I use Alfred which wasn't finding all my apps (and neither was Spotlight) so in checking out a solution to this found the following fix which needs to be run in Terminal. I have no idea what it does, but it has fixed all my problems.

First delete and rebuild the spotlight index. Then run terminal and type

arch -i386 mdimport /Applications

Once this completed Alfred found all my apps, Spotlight concurred, and Mac App Store showed 14 updated in the update panel whereas before it said all apps were up to date.

No they genuinely are!!

Thanks, worked for me too! Keep up the good work!

Message was edited by: RJ2544