Unable to activate windows app store - Install failed(VS 2015, UWP)

I try to debug a UWP app that I developed, using UWP in VS 2015 Enterprise.. When I try to run it , I get the following message:
"Unable to activate windows store app (app name). The activation request failed with error 'Install failed'. Please contact your software vendor.

I know the question was asked before, I try the following:

  • Uninstall the app
  • Unistall VS
  • PC restart
  • Deleting all the build directories

Moreover, I checked and the app temporary file were created in
C:\Users(My User)\AppData\Local\Packages(App name)....

Any ideas?


ANSWERS:


Check this: And this:

And make sure you activated Developer Mode from settings.



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