Forum Discussion
Visuals Break with "Error Fetching Data" When Filtering by Date (Import Mode Model)
Hi Ahmad_1,
Thank you for the Follow-up question and confirming that the credentials and MySQL Connector are working fine in Power BI Desktop.Based on your setup (MySQL Connector/NET 8.3.x with Power BI Report Server January 2025), this error can occur if the connector isn’t correctly registered or accessible to the Report Server service. Please try reinstalling the connector using Run as Administrator so it registers properly in the Global Assembly Cache (GAC), then restart the Power BI Report Server service. Also, ensure the Report Server service account has read access to the connector’s installation path.
If the issue persists, try using the previous stable MySQL Connector version (8.2.x), which has shown better compatibility with the January 2025 build. After reinstalling, re-upload the PBIX and re-enter the credentials in Report Manager.
Let us know how it goes we will be happy to assist further if the error remains.
Thank yor for using the Microsoft Fabric Comminity Forum.
Hi v-kpoloju-msft ,
Thank you for the support. I haven't tried the solution you provided yet. I just want to know one more thing: does it work well with Power BI Report Server?
Hi Ahmad_1,
Thank you for the follow-up. The steps we shared earlier were primarily tested for Power BI Desktop / Fabric. While some of the suggestions like changing slicer types or clearing cache can also apply to Power BI Report Server, we haven’t seen official confirmation that the exact fix fully resolves this issue on Report Server builds.
I would recommend testing the steps first in a safe report copy on your Report Server environment. If the issue persists there, we can help investigate further and check if any Report Server-specific considerations are needed.
Hope that clarifies. Let us know if you have any doubts regarding this. We will be happy to help.
Thank you.
Hi Ahmad_1,
Just checking in to see if the issue has been resolved on your end. If the earlier suggestions helped, that’s great to hear! And if you’re still facing challenges, feel free to share more details happy to assist further.Thank you.
Hi v-kpoloju-msft ,
Apologies for the delay. Yes, it works completely fine after downgrading the Power BI Report Server from May 2025 to January 2025. However, I’m facing another issue when I upload my report (PBIX file) to the Report Server and try to add my data source credentials for setting up the refresh schedule, it gives me the following error:
"Couldn't connect The report server couldn't connect to the data source using the information you entered. Make sure you've entered the connection string and any credentials correctly. Hide error details Requested value 'None' was not found."
Although it works fine in Power BI Desktop 2025 (Optimized for Report Server).
Hi Ahmad_1,
Thanks for confirming that downgrading to the January 2025 Report Server resolved your earlier issue glad to hear that.
Regarding the new error: "Requested value 'None' was not found"
This usually appears when the authentication type or credential settings in the Report Server don’t match those used in Power BI Desktop (Optimized for Report Server). Please check.The data source type (e.g., SQL Server, Analysis Services, etc.). The authentication method selected in Report Manager. That your PBIX was saved using Power BI Desktop (Optimized for Report Server – January 2025).
You can also try deleting and re-adding the data source connection in Report Manager, then restarting the Report Server service. If the issue persists, please share the above details so we can help identify whether it’s a credential or version-related issue.
Thanks again for your patience and detailed follow-up.