Did you installed the Windows 10 emulators, but when running Visual Studio 2015 they are still missing?
Then here is your solution! Install Visual Studio 2015 Update 1
and make sure to check out the 'Universal Windows App Development Tools'
I run against this issue after installing visual studio without the WDK and emulators. Then I decided to install them anyway by going to the Windows Development Center and noticed it did not worked out... so hopefully when you having this issue, installing the update 1 package helps you out!
Get the vs update 1 here: