"Program does not contain a static 'Main' method suitable for an entry point" error.

Area of Cosmos - What area of Cosmos are we dealing with?

I am trying out Cosmos for making an “OS”. I am using Cosmos UserKit20190508 with Visual Studio 2019. I previously had few error which were resolved with the help of NuGet Packages. However, another error is popping out demanding a Main() method.

Expected Behaviour - What do you think that should happen?

OS emulator should open and the code should run in it as an OS.

Actual Behaviour - What unexpectedly happens?

I am getting an error in the Error List demanding a Main() method for “suitable entry point”.

Reproduction - How did you get this error to appear?

I normally clicked the green button with “Cosmos” written on it. And the error appeared in the Error List.

Version - Were you using the User Kit or Dev Kit? And what User Kit version or Dev Kit commit (Cosmos, IL2CPU, X#)?

I am using Cosmos UserKit20190508 with Visual Studio 2019.

Error Code and Error

Error Code: CS5001 Error Description: Program does not contain a static 'Main' method suitable for an entry point

This is the error (in the Error List dialog box at the bottom of the screen):

How do I resolve this error?

[quajak]

It should be set Class Library

[nixls]

Wasn’t able to reproduce on Visual Studio 2019 16.0.3 fresh install with cosmos user kit 20190508. I had the same error that is referenced but after 10 seconds it disappeared automatically.