You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

neil456 Author

Level 1

14 points

iTunes was unable to load data class information from Sync Services

Not sure when it started, but I just noticed that my devices are not backing up when i sync in itunes.

This includes both iPad, iPhone 4s with 6.0.1 (10A523), Mac Lion 10.7.5, and iTunes 10.7 (21). Includes both WiFi and USB connections.

I get a lot of these in the logfile:

11/18/12 10:12:45.117 AM taskgated: killed com.apple.SyncServices.AppleMobileDeviceHelper[pid 1761] because its use of the com.apple.private.tcc.allow entitlement is not allowed

11/18/12 10:12:45.117 AM [0x0-0x63063].com.apple.iTunes: Exec for child /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/Current/Apple MobileDeviceHelper.app/Contents/MacOS/AppleMobileDeviceHelper failed or inexplicably returned

11/18/12 10:12:45.117 AM [0x0-0x63063].com.apple.iTunes: Parent: Can't write length for data

11/18/12 10:12:45.117 AM [0x0-0x63063].com.apple.iTunes: Parent: Can't talk to child

11/18/12 10:12:45.117 AM [0x0-0x63063].com.apple.iTunes: Parent: Can't write length for data

11/18/12 10:12:45.117 AM [0x0-0x63063].com.apple.iTunes: Parent: write to child failed, trying to create child again...

11/18/12 10:12:45.117 AM [0x0-0x63063].com.apple.iTunes: Exec of child with pid 1761 failed with error 255

Applications are updated on the device, but my backups do not occur and iTunes summary says, "Last backup to this computer: Unknown".

When I connect the device I always get, "iTunes was unable to load data class information from Sync Services. Reconnect or try again later."

I have reset sync services, rebooted Mac, rebooted iPhone, repaired permissions, and reinstalled iTunes. All of which had no effect on solving the problem.

iPhone 4S, Mac OS X (10.7.5)

Posted on Nov 18, 2012 8:33 AM

38 replies

spalmen

Level 1

0 points

Dec 1, 2012 1:39 PM in response to Z42

/System/Library/PrivateFrameworks/

FWIW, after deleting it, I restarted, then reinstalled iTunes 11. This cleared the sync issue for all my devices. Good luck!

spalmen

Level 1

0 points

Dec 1, 2012 1:42 PM in response to spalmen

To clarify my earlier post, I deleted:

/System/Library/PrivateFrameworks/MobileDevice.framework

DO NOT delete the PrivateFrameworks directory.

nirkale

Level 1

0 points

Dec 3, 2012 12:15 AM in response to spalmen

Had the same problem. Got solved by this thread. Thanks a lot guys!!

Z42

Level 1

9 points

Dec 3, 2012 3:37 AM in response to nirkale

Solved it for me. Thank you.

FireFish

Level 1

68 points

Dec 4, 2012 7:04 PM in response to spalmen

spalmen wrote:

/System/Library/PrivateFrameworks/MobileDevice.framework

FWIW, after deleting it, I restarted, then reinstalled iTunes 11. This cleared the sync issue for all my devices. Good luck!

Works like a charm!

I too think like you, . . . after deleting, I cleared trash, rebooted, reinstalled iTunes 11 & then re-synced.

Re-solved!!🙂

Dec 6, 2012 12:50 AM in response to tiberius-hk

Thanks, that fixed it for me.

Dec 10, 2012 5:12 PM in response to neil456

Thats woks for me, thanks a lot.

Dec 10, 2012 6:23 PM in response to spalmen

Same problem. That fixed.

Thanks!

Dec 14, 2012 6:38 AM in response to Lee_HyungJic

Same problem, also fixed on my Mac. All my device backup are here again in iTunes…

Thanks !

drlaz

Level 1

8 points

Dec 14, 2012 5:19 PM in response to neil456

I don't know if the problem was solved by deleting MobileDevice.framework or by the fact that the re-installation of iTunes was 11.0.1 (update). But it's fixed. Thanks.

jlundell

Level 1

4 points

Dec 21, 2012 3:42 PM in response to neil456

Xcode 4.6 DP4 seems to have fixed the problem, at least so far. iTunes was not able to see my device backups until just now when I installed DP4.

BPeres

Level 1

0 points

Jan 4, 2013 2:08 AM in response to neil456

Hey thanks for the help, I was wondering why I was getting this error (turns out it was from installing the XCode Dev Preview).

I had to look up how to reinstall iTunes, since I assumed I had to uninstall it first, but that's definitely not the case. You can just download the installer from Apple. Thanks everyone!

Paul

Level 1

0 points

Jan 5, 2013 10:14 AM in response to neil456

Same problem, but found a simpler solution.

You don't need to delete/reinstall iTunes, just stop the "Apple Mobile Device" service and then restart it.

http://reviews.cnet.com/8301-19512_7-10115187-233.html

juicerap

Level 1

0 points

Feb 2, 2013 1:30 PM in response to Altaveron

Solved it for me! Thanks!

jagbloke

Level 1

0 points

Feb 3, 2013 3:05 PM in response to neil456

Had this problem for ages. Went through all the solutions, mostly didn't have the folders I was told to delete or don't have Outlook, blah blah. Didn't want to uninstall iTunes.

Guess what? I was logged on as a different user. Just logged my wife off (so I was the only user on the machine) and Bob's the proverbial (if you're American that probably won't mean much but it made me smile).

Happy days.

iTunes was unable to load data class information from Sync Services