Can not build with qt creator and ubuntu

Hi,

after a fresh install of qt according to those steps:

https://wiki.qt.io/Install_Qt_5_on_Ubuntu

on an ubuntu 16.04 system, i can not compile any project in qt creator. I just loaded a template qt project, tried to compile and get:

16:06:11: Das Verzeichnis "/home/stefan/projekte/Fehler in " Util.asciify("build-untitled-Desktop_Qt_5_7_0_GCC_64bit-Debug")": TypeError: Property 'asciify' of object Core::Internal::UtilsJsExtension(0x1cb9f10) is not a function" konnte nicht angelegt werden

The only help I found was QTBUG-59509, but this did not help. I figured that the path of qmake might have been wrong after the initial installation, so I changed that path to my qt5.7 installation directory

QTTOOLDIR="/home/stefan/Qt5.7.0/5.7/gcc_64/bin"
QTLIBDIR="/home/stefan/Qt5.7.0/5.7/gcc_64/lib"

Still nothing is working. Can someone help?