You are using an unsupported browser. Please update your browser to the latest version on or before July 31, 2020.
Home > Resolutions for Transaction Pro Importer Issues > Desktop Importer > Cannot Connect to Your Data Source. Class not registered.
Cannot Connect to Your Data Source. Class not registered.
print icon



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





  • Click OK. Does 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
11 out of 50 found this helpful

scroll to top icon