iTunes was unable to load dataclass information from sync services

Question

Level 1

0 points

iTunes was unable to load dataclass information from sync services

Ever since the 9.1 update I have received the error stating "iTunes was unable to load dataclass information from sync services" and have not been able to sync my iPhone to my laptop PC. I have tried the following with no success:

1. Reinstall iTunes
2. Per a suggestion on the forum I ran MobileMe to look for an error when that started up, but it started no problem.
3. Look for duplicate .dll files on my pc, but none were found
4. Checked http://support.apple.com/kb/TS2690 , but none of these apply.

I can sync the phone up to another PC. Does anyone have any suggestions? Below is the diagnosis I ran. Thanks for any help you can give.

Microsoft Windows XP Professional Service Pack 2 (Build 2600)
Dell Inc. Latitude D620
iTunes 9.1.0.79
QuickTime 7.6.6
FairPlay 1.7.16
Apple Application Support 1.2.1
iPod Updater Library 9.0d11
CD Driver 2.2.0.1
CD Driver DLL 2.1.1.1
Apple Mobile Device 3.0.0.102
Apple Mobile Device Driver 1.46.0.0
Bonjour 2.0.0.34 (214.3)

Current user is an administrator.
The current local date and time is 2010-04-13 10:11:48.
iTunes is not running in safe mode.

Video Display Information

Mobile Intel(R) 945GM Express Chipset Family
Mobile Intel(R) 945GM Express Chipset Family

** External Plug-ins Information **

No external plug-ins installed.

** iPod/iPhone Connectivity Tests **

iPodService 9.1.0.79 is currently running.
iTunesHelper 9.1.0.79 is currently running.
Apple Mobile Device service 3.0.0.0 is currently running.

Universal Serial Bus Controllers:

Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27C8. Device is working properly.
Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27C9. Device is working properly.
Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27CA. Device is working properly.
Intel(R) 82801G (ICH7 Family) USB Universal Host Controller - 27CB. Device is working properly.
Intel(R) 82801G (ICH7 Family) USB2 Enhanced Host Controller - 27CC. Device is working properly.

No FireWire (IEEE 1394) Host Controller found.

Most Recent Device Not Currently Connected:

iPhone 3G running firmware version 3.1.3

** iPhone/iPod Touch Sync Tests **

Sync tests completed successfully.

Dell Latitute D620, Windows XP Pro

Posted on Apr 13, 2010 7:50 AM

Reply

Answer 1

FMouraBR

Level 1

0 points

Apr 13, 2010 2:57 PM in response to johnnie124

Hi my friend I have the same problem as you, but I use Windows 7 64, I can't syncronize with my PC in iTunes, but in PC of my work yes, if someone know how to solve this plz help!!

I use Iphone 3G 3.1.2

Reply

Answer 2

KennedyS

Level 1

0 points

Apr 14, 2010 1:20 PM in response to johnnie124

I'm running into the same issue with iTunes 9.1 a 3GS iPhone and Windows XP SP3. Tried everything I found online including:

1. Reinstalling iTunes
2. Removing all Apple Products then reinstalling iTunes
3. Clearing out Sync Services folder in Documents & Settings-<UserName>-Apple Computer-SyncServices
4. Cleared out temp files
5. Tried plugging into other USB ports

And a whole lot more. Nothing is working! Hope somebody comes up with something soon.

Reply

Answer 3

Apr 21, 2010 8:31 PM in response to johnnie124

I'm currently having the same problem.. Tried everything uninstalled and reinstalled all Apple products, stuck completely on what to do next.. has anyone cracked it yet? Thanks 🙂

Reply

Answer 4

Apr 25, 2010 3:55 PM in response to johnnie124

Same issue for me. I have a 3G and XP. I've done everything above, including copying and pasting the libxml2.dll file and renaming that and another file to .dl instead of .dll, None of which are working. Is Apple doing anything to fix this? There seriously needs to be an iTunes update to address this. Any help would be appreciated!

Reply

Answer 5

coglia

Level 1

0 points

Apr 26, 2010 7:56 AM in response to rgoodman4483

Same trouble for me on Windows7 64bit, iPhone 3G.
I tried everything, I went to a genius bar too, but they said they have to format my pc or I have to wait for a new version of iTunes...

Reply

Answer 6

coglia

Level 1

0 points

Apr 28, 2010 2:28 PM in response to coglia

the new version of iTunes just downloaded solved my troubles! 🙂

Reply

Answer 7

Lantry

Level 1

0 points

May 6, 2010 6:18 PM in response to johnnie124

I had gotten a similar problem, except with "provider services", i believe, but i solved it by copying sqlite3.dll from E:\Program Files\Common Files\Apple\Apple Application Support to E:\Program Files\Common Files\Apple\Mobile Device Support. doing that solved my first problem, but now i have been getting the error described in this topic (unable to load dataclass info... etc.). i tried reinstalling itunes (i already had 9.1.1, and thats what i reinstalled) by using the method described on apples site (using the "remove programs" tool in the control panel) and then downloading and installing itunes. when i opened it again, i still got the same error, and just now i got an error saying "the instruction at "0x00aadb6b" referenced memory at "0x00000008". the memory could not be read" it gave me the option to cancel and debug, or to press ok and terminate the program. I tried pressing cancel, and the popup went away but nothing else happened. a minute later the popup was back, so i pressed ok and itunes quit. Upon opening Itunes again, i got the very same error. sorry for the long post, but its really been bugging me. thanks for any help you might give, and if you need anymore info, feel free to contact me.

Reply

Answer 8

Lantry

Level 1

0 points

May 6, 2010 6:54 PM in response to Lantry

UPDATE: upon trying to sync, MD crash report tool, ironically enough, crashed.
when it got to the backup part of the sync, i clicked the x button to cancel the backup, like ii always do. after of few minutes of my computer being almost completely frozen, "mobile backup tool" or something like that crashed, and the sync was automatically cancelled.

Reply

Answer 9

Lantry

Level 1

0 points

May 8, 2010 8:17 AM in response to Lantry

I think i found a solution!
after much tinkering, i uninstalled itunes using the control panel, moved the folders "Apple application support" and "mobile device support" from E:\Program Files\Common Files\Apple to my desktop, so that they were no longer in use. i then reinstalled itunes, and so far it has worked.

Reply

Answer 10

May 12, 2010 4:45 PM in response to johnnie124

The recent iTunes update did little to fix the problem for me. The first couple of times I synced, I had no problems, but now it has started giving the error message again. I'm getting really fed up now and am absolutely disgusted that Apple wants to charge me $30 just to talk to a tech to fix this seemingly minor problem. Anyone else have a suggestion?

Reply

Answer 11

marwil00

Level 1

0 points

May 13, 2010 5:32 AM in response to johnnie124

Getting same error/problem after upgrading to 3.1.3 and iTunes 9.1.1.12.

Come on Apple, get a fix out there today.

Support is getting worse.

Reply

Answer 12

rjmoman

Level 1

0 points

May 14, 2010 7:18 AM in response to johnnie124

I am having the same issues and have done the same things as many of you. I am really getting frustrated b/c I know cant get my iPhone to sync properly. It is taking at least an hour to backup (I dont have a lot pics) when it only took 5 mins, I also cant get my music library to sync either. Errgghhh!!

Reply

Answer 13

JBogdan

Level 1

4 points

May 25, 2010 8:56 PM in response to rjmoman

I have the same problem, too. 64gb 3g Touch & Windows XP Professional. Aren't there enough posts that Apple should take notice!??

Reply

Answer 14

May 27, 2010 1:14 PM in response to johnnie124

I have the same problem as everyone else. Windows 7 machine - x64. Getting the same error message since version 9.1 of iTunes. Music, podcasts and apps all sync fine with my 3G iPhone. But contacts & calendar info do not. As time passes my iPhone contact and calendar info is getting increasingly out of date.

I tried repairing my iTunes installation. I haven't tried a complete uninstall and re-install because others say it doesn't work and I don't want to recreate my entire library.

Help.

Reply

Answer 15

Thomas8

Level 1

0 points

May 31, 2010 7:28 PM in response to Lantry

Thanks for posting this. It seems to have fixed my issue which resembles the others on this thread.

Reply