MESSAGE

Cannot connect to your data source. Check your database type selection and try again. The following message was returned: Class not registered.

Line: 0 Class not registered

RESOLUTION

• Click OK. Does Rightworks Transaction Pro allow the previously attached file to be removed or a new file selected to attach? If so, then the error means that it cannot locate the file that was previously used to import.

• If the above does not resolve the issue, try attaching a .csv or .txt file. Does the same error occur? Does the error only occur when attaching an Excel file? If so, then follow the resolution in this Knowledge Base Article: Microsoft Access Database Engine is Required

• If neither of the resolutions above resolve the issue, try completely uninstalling and reinstalling Transaction Pro following the steps below:
  • Uninstall Transaction Pro
  • Reboot your computer
  • Reinstall Transaction Pro
  • Reboot your computer
  • Launch QuickBooks
  • Launch Transaction Pro
  • Activate Transaction Pro 

• For Version 8 users: If none of the above resolutions work, please register the following dll file, following the instructions in this ARTICLE.
  • File Name to Register:   coreobjx64launcherv8.dll