Forum Discussion

KenCBowman's avatar
KenCBowman
Advocate I
1 year ago

Power Bi Report Server May 2025 Errors

I upgraded my Windows Server 2019 from Power BI Report Server (May 2024) to Power BI Report Server (May 2025) and am now seeing the following errors in the browser's console:   https://dev.my-site...
"Power BI Report Server May 2025”
Shahid12523's avatar
Shahid12523
Community Champion
1 year ago

After upgrading to Power BI Report Server (May 2025), you're seeing:
404 error for styleLibrary.js — file not found or MIME type misconfigured
Angular injection error for PBICopilotProxy — likely due to missing Copilot services

 

Quick Fixes:
Check if styleLibrary.js exists and is served with correct MIME type (application/javascript)
Ensure reportServerHostModern.js loads properly
Disable Copilot features if not supported in your setup
Review IIS and server config for missing assets or MIME settings

KenCBowman's avatar
KenCBowman
Advocate I
1 year ago

Hi Shahed,

We continue to receive the following errors even for the simplest Power BI reports after upgrading to Power BI Report Server (May 2025).

We've tried running Repair multiple times, examined the Report Server and Event logs for any errors, reviewed the Report Server configuraiton files, etc., none of which has given us any clue as to how to fix the errors.

 

I assume the MIME issue is related to styleLibrary.js not existing. Is there somewhere on my physical server to look for the existence of this file?

 

I would happily disable Copilot features in Power BI Report Server. How do I do that?

 

Thanks,

 

Ken