Hi @JKEM Agent 007 ,
Please check your .NET Framework version and the versions of these things below.
- Microsoft RDLC Report Designer in Extensions.
- Microsoft.ReportingServices.ReportViewerControl.WinFroms in NuGet Package Manager.
It is recommended to upgrade to their latest version to avoid compatibility issues.
If there are any other problems, please let us know.
Best Regards.
Jiachen Li
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Thank you I have tried your suggestion, it works! Thank you so much