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Hi saran8 ,

Based on the information you have provided, this error may occur when the code tries to use a string that has not been initialised. Here are a few steps to troubleshoot and resolve this issue:

1. Ensure that the Web URL from which you are attempting to import data is correct and accessible.
Verify that any necessary query parameters or headers are properly configured in Power BI.

2. Verify that the SSO configuration is set up correctly in Power BI. For the DirectQuery semantic model, SSO settings do not affect the data import process. However, for import scenarios, the SSO credentials of the semantic model owner may be used, depending on the configuration.
You can find more information about SSO configuration here.

Configure Kerberos-based SSO from Power BI service to on-premises data sources - Power BI | Microsoft Learn

If the above steps do not resolve your issue, please provide your version of Power Bi Desktop, describing what you did before the problem occurred. This can help us better understand and solve your problem.

Best Regards,

Ada Wang

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