Visual Studio 2013 error Qt Visual Studio Add-in The following error occured: There's no Qt version assigned to this project for platform x64. Please use the 'change Qt version' feature and choose a valid Qt version for this platform.

[mohamedosama914]

Qt Options Qt Versions
Path C:\Qt\Qt5.6.0\5.6\msvc2015_64
Default QtpvVin version: msvc2015 64

Qt Visual Studio Add-in
The following error occured:
There's no Qt version assigned to this project for platform x64. Please
use the 'change Qt version' feature and choose a valid Qt version for
this platform.

[Amelioratede]

That's because you did not attack a qmake tool to the project. Click on QT VS TOOLS button -> Qt Project Settings （if theres no such section, click convert project to Qt Vs tools Project）-> In properties column, version attribution -> select your Qt version compiler.