Impossible to use Visual Studio 2015 Debugger anymore (Unity 5.2.1f)

Hello, everything was working fine but now for no reason i dont have the button “Start in unity” on top to launch the VS debugger. i only have “start” instead and when i press it i drop me an error :

A project with an Output type of Class Library cannot be started directly In order to debug this project, add an executable project to this solution which references the library project. Set the executable project as the startup project.

  • I tryed deleting everything exept “Assets” and “ProjectSettings” and relaunching unity, did not fix anything.

  • I tryed restarting unity with VS open

  • I tryed restarting VS with unity open

Nothing seems to be working and i’m stuck because i needed to use the debugger right now.

I will try rebooting the computer right now.

Any help would be greatly appreciated.

EDIT : apparently rebooting fixed the problem for now but if this happens again i would love to know a workaround without having to reboot the machine.

Anyone find a fix for this? I have had the same problem, like… forever.
And I USED TO have debugging tools in 4+

I have been searching through various posts relating to VU, to find a correlation.

@sandeepsmartest, there’s a lot of wanna-be answers out there, but this seems to be the best. If I find that it works, I’ll let you know.
Hopefully one of us can help the rest of the community.

(I have not tried it. I have a game industry party this Saturday and I want to stay productive and crunch right until then)

http://stackoverflow.com/questions/31553879/visual-studio-2015-for-unity3d-error-incompatible-project