I have installed the NorthWind SQL DB , copied the NorthwindBlazor solution from the radzen-master zip file to my PC and added it into radzen. Here is the result when I click "run":
radzen: Generating code ...
radzen: Code generation done in 402ms.
dotnet: Specify which project file to use because XXXXXXXXXXXXXX\repos\radzen-master\NorthwindBlazor\server contains more than one project file.
Looks identical - unfortunately I'm out of ideas. Try to create new Blazor application in Radzen, add new MSSQL data-source connected to Northwind database and try to run it.
Error in VS, but it runs fine from radzen
C:\Users\xxxxxx\OneDrive\repos\NTour\meta\ : error : Configuring IIS Express failed with the following error: