Hello, I tried to build C# project in order to debug further. But it fails. I have no idea what ".pri" file is. Any suggestion will be appreciated. PROBLEM VS fails to build Unity C# projects. When it fails, the following message is logged in output window. WHAT I DID Build project from Unity to Visual Studio projects. Build "Assembly-CSharp-firstpass" project first, "Assembly-CSharp" project next, and build myApp project. And VS failed to build myApp project with the error above. NOTES It fails when "Unity C# projects" is checked for WSA build settings. It build successfully when it is unchecked.