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

[maskedmouse]

I'm trying to add TUnit testing to my already existing Blazor hybrid + Web API project but I keep receiving the error CSC : error CS5001: Program does not contain a static 'Main' method suitable for an entry point

Even in a completely new web api project it keeps throwing this error.
I am not sure what is expected here since the documentation says:
And then remove any automatically generated Program.cs or main method, as this'll be taken care of by the TUnit package.

In visual studio there isn't even a "Use testing platform server mode" anymore in the insiders version.
Primarily I use Rider which I already enabled the Testing platform support.

This is the Tests.csproj it references the main project.
The main project does include a Program.Main
The Tests project does not.

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net10.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <ProjectReference Include="..\Name\InsertProjectName.csproj" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.0" />
    <PackageReference Include="TUnit" Version="1.2.3" />
  </ItemGroup>

</Project>

So have I forgotten something, is it not compatible with the latest version or did I do something wrong?
The template seems to have the same error.

Using the latest version of Rider (2025.3.0.1), Visual Studio Community 2026 (11206.111) and TUnit 1.2.3.

[thomhurst]

Try adding output type exe.

If not, do you have a directory build props file configuring stuff?

[maskedmouse]

Adding <OutputType>exe</OutputType> to the Tests project does not seem to fix it.
I don't have any Directory.Build.props file.

The templates from TUnit.Templates 1.2.3 gave me the same error.
So I'm uncertain where this originates from.

[thomhurst]

@maskedmouse I'm gonna need a reproduction project