Visual Studio 2015 project no longer runs in debug mode

Question

This is what I get even when I run in the Debug configuration:

The way I got this to show was by enabling "Just My Code" and warn if there

Answer 1

This has happened to me on a couple of projects too. I reviewed my build settings, as suggested by stuartd. However, 'Optimize code' was not enabled in my build settings. So I enabled it and saved the project. Then I unchecked it and saved again. Problem solved.

There's some kind of bug that causes the --optimize+ flag to be passed to the debugger. Enabling it and then disabling it is an easy workaround until the bug is fixed.

Answer 2

I had the same issue... No matter what I did - nothing worked.

It was an new empty project that was the problem. I ended up removing the project and adding a new project - the new project had to have another name; if I used the same name the error just reappeared - even after a reboot, clean and rebuild... It must be a bug in Visual Studio 2015.

Answer 3

Resolution steps:

• Go to the Build settings of the offending project's Properties page.

• Scroll right down to the “Advanced...” button.

• Make sure “Debug Info:” is not set to “none”.

  I recommend you to use the full option.

Answer 4

In my case the problem was that the IIS Project URL in my ASP.NET project properties web tab was set to the wrong URL.

It was pointing to http://localhost which I was using with a different copy of the project. The address for the solution I had open was actually configured on my local IIS as http://localhost:90.

Changing to the correct address fixed the problem.

Answer 5

I encountered this issue as well. The fix that worked for was to simply clean (Build > Clean Solution) and rebuild (Build > Rebuild Solution) my projects.

Answer 6

None of the previous answers worked for me. Restarting IIS fixed it.