Web Connector Troubleshooting
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      3. Web Connector Troubleshooting

      Unable to cast COM object of type 'System.__ComObject' to interface type 'Interop.QBXMLRP2.RequestProcessor2'

      You must install the QuickBooks SDK

      Problem

      When you run the web connector, you get this error:

      Unable to cast COM object of type 'System.__ComObject' to interface type 'Interop.QBXMLRP2.RequestProcessor2'

      Description

      You must install the QuickBooks SDK. Some files are missing.
      Download QB SDK 14.
      Download QB SDK 15.

      Solution

      Install the SDK

      1. Go here: C:\Program Files (x86)\Intuit\IDN\QBSDK14.0\tools\installers
      2. Double click QBXMLRP2Installer.exe:
      3. Reboot.
      4. Run the web connector again.