Hi Dhivya_123456 

Generally a status code 500 with “undefined” error in Power BI Report Server typically points to a server side  fault often due to corrupted report definitions, missing database content, or permission/configuration issues on the back-end. This error may surface when the server is unable to load or find the required report resources within its database, or if there’s a bug in how extended report content is fetched.

There are some troubleshooting steps that you can follow:

• Check Report Exists & Is Not Corrupted : Ensure the report exists and is not corrupted. If possible, try re-uploading or redeploying the PBIX file to the Report Server.
• Permissions and Path : Double check that permissions are correctly set for the Report Server service account and that the report paths and data source references are accurate
• Logs and Upgrades :  Review the server’s log files for the specific error message Also, consider upgrading PBIRS if you’re on an older version, as bugs like this have been solved in later builds

Please share if you encounter any further issues

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