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Here I have a .NET 6 ASP.NET project. When run IIS Express, it pops "RunCommand property is not defined".
How did you create the project?
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an asp.net core application should be a console app, not a class library. also in the project file it should specify the web sdk:
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<TargetFramework>net6.0</TargetFramework>
<Nullable>enable</Nullable>
<ImplicitUsings>enable</ImplicitUsings>
</PropertyGroup>
</Project>