Another Problem with my Apple products "iTunes could not connect to this iPhone. This device is no longer connected."

when connect my ipad a my rmbp 15" appears this message "iTunes could not connect to this iPhone. This device is no longer connected." and ipad  is connected and disconnected all the time. but when connect the Ipad in my rmbp 13" not have a problem.
Please I need help. i hope not to have another disappointment with  apple product.

iTunes could not connect to this iPhone. This device is no longer connected.
iPad 2 7.1.2
iTunes 11.3 (54)
iMac 27 in 10.9.4
Follow these steps to resolve your issue for iPads
Troubleshooting time is about 30 minutes - 1 hour
Step 1
Unplug the usb 2.0 cord from the 27 in iMac and iPad 2 64 GB (or what ever version you have) Power down the iPad
Step 2
Select your HD (Hard Drive) ( I did  this form my desk top)
Next select the applications folder, Next right click the iTunes icon and select show package contents, select Contents.
1.     Next select info.plist, right click and select move to trash (A message should appear Finder wants to make changes. Type your password to allow this)(Enter your password) Select ok, (This moves the file to the trash).
2.     Next select pkginfo, right click and select move to trash. (A message should appear Finder wants to make changes. Type your password to allow this)(Enter your password) Select ok, (This moves the file to the trash).
3.     Next Select version.plist, right click and select move to trash (A message should appear Finder wants to make changes. Type your password to allow this)(Enter your password) Select ok, (This moves the file to the trash).
4.     Remove "iTunes" from your dock
5.     From the Finder, choose Go > Go to folder.
6. Type the following and then press Return:
/var/db/lockdown
7. Choose View > as Icons.
8. The Finder window should display one or more files with long alphanumeric file names.
9. In the Finder, choose Edit > Select all. Then, choose File > Move to Trash. Enter an administrator password if prompted.
Note: Do not delete the Lockdown folder itself.
Delete only the files contained inside the Lockdown folder.
Step 3
Follow the below steps to troubleshoot the issue.
1. In Finder, click the Go menu and then choose Go to Folder. Enter the following location into the text field that appears:
/System/Library/LaunchDaemons
2. Click Go.
3. Locate the file "com.apple.usbmuxd.plist~orig" and drag it to the Trash. (Do not move the similarly named "com.apple.usbmuxd.plist" file to the Trash.) If you DO NOT HAVE file "com.apple.usbmuxd.plist~orig" I DELETED THE FOLLOWING (com.apple.usb.plist)
4. In the Finder, locate iTunes in the Applications folder and drag it to the Trash. (This will not remove any of your iTunes media or your iTunes library.) You may be presented with the following message “iTunes” can’t be modified or deleted because it’s required by OS X.) Do not worry click ok and proceed troubleshooting
5. Choose Go > Go to Folder. Enter the following location into the text field that appears:
/System/Library/Extensions
6. Click Go.
7. Locate the file "AppleMobileDevice.kext" and drag it to the Trash.
8. In Finder, click the Go menu and then choose Go to Folder. Enter the following location into the text field that appears:
/System/Library/PrivateFrameworks
9. Click Go.
10. Locate the folder "MobileDevice.framework" and drag it to the Trash.
11. In Finder, click the Go menu and then choose Go to Folder. Enter the following location into the text field that appears:
/System/Library/LaunchDaemons
12. Click Go.
Step 4
Goto your hard drive in the finder
1.     Goto Library
2.     Goto Launch Daemons
3.     Throw this in the trash: com.ghughes.wifisync.root.plist and anything with the words iTunes
4.     Goto Library
5.     Goto Application Support
6.     Throw this in the trash: Wi-Fi Sync (it's an entire folder) and anything with iTunes
Step 5
(Before restart book mark the link command and D). Restart the Mac.
Download iTunes and reinstall it. After the install, connect the 2.0 usb device to the iPad 2 while the unit is still powered off, next connect the 2.0 usb cord to iTunes, power the iPad on. iTunes will read the device and ask to trust device, select continue. Backup the iPad device to the 27 in iMac.
Step 6
Please Rate if it helped you! After that have a cold hard drink and enjoy the day

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