If you receiving this error “Unable to start debugging. The startup project could not be launched. Verify debug settings for the startup project” on building your first CORE project inside Visual Studio. Plus you have already marked web project as startup project. Then you need to look into couple of solutions mentioned below.
Make sure you’re launching Visual Studio as Administrator.
- Right click on the Visual Studio 2015 Shortcut
- Select the Shortcut tab
- Click on Advanced
- Check the box to “Run as administrator” at all times
Closed Visual Studio, reopened, and the project builds and runs normally. Simple Restart serves the need.