This error occurs when adding a QWC file to the QuickBooks Web Connector (Unique OwnerID FileID pair value required).  The application will not load into the Web Connector.

Likely cause:  The same QWC file may already have been loaded and registered with QuickBooks and a second copy of the QWC file cannot be added.  This error was reported in the QuickBooks Web Connector version  2.0.0.135 which is automatically installed by QuickBooks 2008 and onwards.  The problem is due to a duplication entries in the Windows Registry

Resolution option one:  Edit the Windows Registry and remove the reference to the old Zed Office Web Service QWC  and then reload the new QWC file. CAUTION: Editing windows registry entries is an advanced technical procedure that may stop other applications working, if in doubt seek technical assistance.

1. Uninstall your current version of QuickBooks Web Connector (2.x) via the control panel
2. Go go to Start > Run and type "regedit" and click enter.
3. Delete the Zed Office Web Service folder from the the windows registry (take care when modifying registries since deleting the incorrect entry may stop other applications working, if possible do a registry backup). Typically you will find this folder at HKEY_CURRENT_USER\Software\Intuit\QBWebConnector\SOAPWebServices\Zed Office Web Service.  We recommend you search the windows registry for "Zed Office Web Service" to ensure that it is removed from the registry.
4. Reboot your machine.
5. Install the latest version of the QuickBooks Web Connector.
6. Add the new QWC file to the Web Connector and attempt an update.

Resolution option two:  We recommend that you remove the current Web Connector version and reinstall the version 1.5 release which does not have this error.

1. Remove the old QWC file from the Web Connector and remove the Zed Office Web Service listing from QuickBooks > Company Preferences > Integrated applications.
2. Uninstall your current version of QuickBooks Web Connector (2.x) via the control panel. (we find Revo Uninstaller useful as it can remove unwanted registry entries and means you can skip the steps 3 & 4 below - but use with caution)
3. Remove any references to the Web Connector in the windows registery (take care when modifying registries since deleting the incorrect entry may stop other applications working, if possible do a registry backup). Go go to Start > Run and type "regedit" and click enter.
4. Browse to the folder HKEY_CURRENT_USER\Software\Intuit\QBWebConnector and delete the contents of the folder.
5. Reboot your desktop. If you are using Microsoft Vista then please make sure that you have UAC set to On
6. Install the QuickBooks Web Connector 1.5 and then add the QWC file into the Web Connector and attempt an update.

To download version 1.5 Click here