Hi Harry Po, As others mentioned, it is a best practice to create separate solution to move your customizations from on Organization to another. If you do so, your solution would only have the customizations you have made rather than including everything like the ones made by other solutions you installed. Normally default solution is exported for Backup purposes. www.microsoft.com/.../export-your-customizations-as-a-solution.aspx To find out why it fails, on this import dialog, if you download the log file and open it in Excel, you can see exactly where and what component failed and for what reason it failed. Could you post the actual error message from the Log file? If its OnPrem, you could also enable the tracing and see if the error message points to the component that fails to import. Thanks
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