iTunes was unable to load data class information from Sync Services

I'm having this exact problem. Did you by any chance install a 6.1 beta at some point on any of your devices? I did that and I feel like that's when this started happening, but of course it's affecting all of my devices.

Yeah. I'm in the same boat after installing Xcode 4.6 Preview. At least, this is what I think is causing it. Not sure.

Same here. It sounds like we've found the cause.

Same here:

On an iMac12,2, OS X 10.8.2 (12C60), admin user, regular home dir. Enable access for assistive devices checked. USB keyboard, Bluetooth Apple Magic Mouse and Apple Wireless Trackpad. With Xcode Version 4.5.2 (4G2008a) AND Xcode Version 4.6 (4H95e) installed.

Start iTunes 10.7 (21) with an iPhone 4S with iOS 6.0.1 (10A523), same error dialog as mentioned and this in the log:

taskgated[24614]: killed com.apple.SyncServices.AppleMobileDeviceHelper[pid 24623] because its use of the com.apple.private.tcc.allow entitlement is not allowed

Starting Xcode 4.5.2 with the same device attached I see these warnings in the system log:

Xcode[24818]: [MT] DVTAssertions: Warning in /SourceCache/IDEKit/IDEKit-1862/Framework/Classes/WelcomeWindow/IDELaunchServic esRegistrationHelper.m:129

Details: Failed to register '/System/Library/CoreServices/CoreTypes.bundle/Contents/Library/MobileDevices.b undle' with Launch Services, error code: -10811.

Object: <IDELaunchServicesRegistrationHelper: 0x4017367a0>

Method: -_registerPathWithLaunchServices:

Thread: <NSThread: 0x40030a1e0>{name = (null), num = 1} Xcode[24818]:

Device attached: (LocationID: 0xFD131100 ECID:0x37C2015DD2D)

Xcode[24818]: initial DVTCertificateUtilities load hasn't happened

I think this started after installing Xcode 4.6 DP2.

Reported Xcode bug 12757073 and iTunes bug 12756888.

Update: the Xcode error goes away once you have installled an app from Xcode to the device. The iTunes error remains however.

Doing some investigation.....

Note I installed Xcode 4.6DP2 on 25th Nov. Not sure my install went totally to plan - a few missing folders:

http://f.cl.ly/items/26402T1R1Y330E3A211n/Text%202012.11.28%203:35:55%20PM.txt

Some diffs:

From 24th Nov MobileDevice.Framework = AppleMobileDeviceHelper - version.plist

<key>BuildVersion</key>

<string>40</string>

<key>CFBundleShortVersionString</key>

<string>5.0</string>

<key>CFBundleVersion</key>

<string>889</string>

<key>ProjectName</key>

<string>Sync</string>

<key>SourceVersion</key>

<string>894000000000000</string>

From 25th Nov MobileDevice.Framework = AppleMobileDeviceHelper - version.plist

<key>BuildVersion</key>

<string>111</string>

<key>CFBundleShortVersionString</key>

<string>5.0</string>

<key>CFBundleVersion</key>

<string>889</string>

<key>ProjectName</key>

<string>Sync</string>

<key>SourceVersion</key>

<string>894000000000000</string>

New build version

From 24th Nov MobileDevice.Framework - version.plist

<key>BuildVersion</key>

<string>22</string>

<key>CFBundleShortVersionString</key>

<string>555.42</string>

<key>CFBundleVersion</key>

<string>555.42</string>

<key>ProjectName</key>

<string>MobileDevice</string>

<key>SourceVersion</key>

<string>555042000000000</string>

From 25th Nov MobileDevice.Framework - version.plist

<key>BuildVersion</key>

<string>5</string>

<key>CFBundleShortVersionString</key>

<string>555.40</string>

<key>CFBundleVersion</key>

<string>555.40</string>

<key>ProjectName</key>

<string>MobileDevice</string>

<key>SourceVersion</key>

<string>555040000000000</string>

New build version and ShortVersionString

The Xcode 4.6DP2 Contents/Resources/Packages has MobileDevice.pkg. In there:

<bundle CFBundleVersion="282" CFBundleShortVersionString="282" SourceVersion="282000000000000" id="com.apple.AirTrafficHost" path="./System/Library/PrivateFrameworks/AirTrafficHost.framework"/>

<bundle CFBundleVersion="260" CFBundleShortVersionString="5.0" SourceVersion="261000000000000" id="com.apple.DeviceLinkX" path="./System/Library/PrivateFrameworks/DeviceLink.framework"/>

<bundle CFBundleVersion="555.42" CFBundleShortVersionString="1.0" SourceVersion="555042000000000" id="com.apple.MobileDevices" path="./System/Library/CoreServices/CoreTypes.bundle/Contents/Library/MobileDev ices.bundle"/>

<bundle CFBundleVersion="889" CFBundleShortVersionString="5.0" SourceVersion="894000000000000" id="com.apple.SyncServices.AppleMobileDeviceHelper" path="./System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/Appl eMobileDeviceHelper.app"/>

<bundle CFBundleVersion="889" CFBundleShortVersionString="5.0" SourceVersion="894000000000000" id="com.apple.SyncServices.AppleMobileSync" path="./System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/Appl eMobileSync.app"/>

<bundle CFBundleVersion="3.3.0" CFBundleShortVersionString="3.3.0" SourceVersion="221001000000000" id="com.apple.driver.AppleMobileDevice" path="./System/Library/Extensions/AppleMobileDevice.kext"/>

<bundle CFBundleVersion="2.3.6" CFBundleShortVersionString="2.3.6" SourceVersion="87002000000000" id="com.apple.driver.AppleUSBEthernetHost" path="./System/Library/Extensions/AppleUSBEthernetHost.kext"/>

<bundle CFBundleVersion="555.42" CFBundleShortVersionString="555.42" SourceVersion="555042000000000" id="com.apple.mobiledevice" path="./System/Library/PrivateFrameworks/MobileDevice.framework"/>

Diffs: http://cl.ly/LC6x/o

Going to try this (I have a full SuperDuper clone for safety):

sudo mv /System/Library/PrivateFrameworks/AirTrafficHost.framework ~/Desktop

sudo mv /System/Library/CoreServices/CoreTypes.bundle/Contents/Library/MobileDevices.bu ndle ~/Desktop

sudo mv /System/Library/PrivateFrameworks/MobileDevice.framework ~/Desktop

mv /private/var/db/receipts/com.apple.pkg.MobileDevice* ~/Desktop

Then reinstall /Applications/Xcode.app/Contents/Resources/Packages/MobileDevice.pkg

......

Seemed to go OK (http://f.cl.ly/items/0t270n250U381r030F3S/Text%202012.11.28%204:08:59%20PM.txt), but some errors re missing kexts:

Nov 28 15:55:19 Jamess-iMac.local installd[43817]: preinstall: (kernel) Kext com.apple.driver.AppleMobileDevice not found for unload request.

Nov 28 15:55:19 Jamess-iMac.local installd[43817]: preinstall: Failed to unload com.apple.driver.AppleMobileDevice - (libkern/kext) not found.

Nov 28 15:55:19 Jamess-iMac.local installd[43817]: preinstall: (kernel) Kext com.apple.driver.AppleUSBEthernetHost not found for unload request.

Nov 28 15:55:19 Jamess-iMac.local installd[43817]: preinstall: Failed to unload com.apple.driver.AppleUSBEthernetHost - (libkern/kext) not found.

However, starting iTunes, no error dialog or system errors and I able to backup to iCloud and my Mac.

The only error I see is:

Nov 28 15:57:12 Jamess-iMac.local AppleMobileDeviceHelper[43919]: 43919:2089484672|BackupCommon.m:_canHandleManifestWithVersion| ERROR: Denying NULL inner manifest version

Not sure how serious that is, will keep on investigating.

UPDATE: Doesn't look like iCloud sync from iTunes is working, but to Mac is.

Wondering if the

Denying NULL inner manifest version

Is something to do with a mismatch between

~/Library/Application Support/MobileSync/Backup/UDID/Manifest.plist

and a value in

~/Library/Application Support/MobileSync/Backup/UDID/Manifest.mbdb

Moving the UDID folder and doing a full new backup stops that error but now I get:

AppleMobileBackup[45185]: INFO: disconnectCallback called with reason: Could not get auth key from new manifest

It still backed up though.

I ran through reseting the sync services http://support.apple.com/kb/TS1627 and then rebooted. This fixed my sync issues on iOS 6.1 beta with beta Xcode

I'm having the same issue after loading beta Xcode and 6.1. I was hoping iTunes 11 would fix the issue...no luck. The resetting synch services did not work for me either. Hopefully Apple will fix this in the next Xcode release...

The resetting synch services and iTunes 11 did not work for me either. How to solve the issue? Please help.

Delete MobileDevice.framework and reinstall iTunes 11.

Where would I find that directory or file(s)?