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.
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Thank you I have tried your suggestion, it works! Thank you so much