The project 'Web' must provide a value for Configuration” error after migrating to .NET Core 3



To fix this :-

If it is in .net 3.0, remove all these

"Microsoft.AspNetCore.Mvc" Version="2.2.0"

"Microsoft.AspNetCore.Mvc.Razor.ViewCompilation" Version="2.2.0"

And make it look like this below :-





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