Parameters supplied is incorrect – Entity Framework Designer

I have faced this error – “Parameters supplied is incorrect”, several times while opening my Entity Model file (.edmx) file using Entity Designer in Visual Studio 2008.

While there is no really sensible explanation to why this error occurs, most of the time it is because of the associations and navigation links get corrupt in the designer. If you open the edmx file using XML editor – (Right click on the file in the Visual Studio Solution Explorer, “Open With”, Select “XML Editor”, and click “Ok”) , you will find the following section at the bottom of the file.

<edmx:Diagrams>

</edmx:Diagrams>

Delete the section <Diagram Name=”…” ….. > </Diagram>. Then save the file and open in the designer. In all cases, it solved my problem.

Hope this helps.

Cheers,

Techie55

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This entry was posted on February 17, 2010 at 10:05 pm and is filed under Entity Framework. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.