agent:2019/08/23 13:47:41 build.go:215: Error in line 3: Namespace "" has invalid syntax in file: "/home/qt/work/build/qtbase/doc/qtquickcontrols/qtquickcontrols.qhp"

agent:2019/08/23 13:47:41 build.go:215: make[4]: Leaving directory '/home/qt/work/build/qtquickcontrols/src/controls'
agent:2019/08/23 13:47:41 build.go:215: make[4]: Entering directory '/home/qt/work/build/qt3d/src/quick3d/imports/render'
agent:2019/08/23 13:47:41 build.go:215: make[4]: Nothing to be done for 'qch_docs'.
agent:2019/08/23 13:47:41 build.go:215: make[4]: Leaving directory '/home/qt/work/build/qt3d/src/quick3d/imports/render'
agent:2019/08/23 13:47:41 build.go:215: cd quick3d/imports/scene2d/ && ( test -e Makefile.importsscene2d || /home/qt/work/build/qtbase/bin/qmake -o Makefile.importsscene2d /home/qt/work/qt/qt5/qt3d/src/quick3d/imports/scene2d/importsscene2d.pro ) && make -f Makefile.importsscene2d qch_docs
agent:2019/08/23 13:47:41 build.go:215: cd extras/ && ( test -e Makefile || /home/qt/work/build/qtbase/bin/qmake -o Makefile /home/qt/work/qt/qt5/qtquickcontrols/src/extras/extras.pro ) && make -f Makefile qch_docs
agent:2019/08/23 13:47:41 build.go:215: make[5]: Entering directory '/home/qt/work/build/qtquickcontrols2/src/imports/controls'
agent:2019/08/23 13:47:41 build.go:215: /home/qt/work/build/qtquickcontrols2/src/imports/controls/qhelpgenerator_wrapper.sh /home/qt/work/build/qtbase/doc/qtquickcontrols/qtquickcontrols.qhp -o /home/qt/work/build/qtbase/doc/qtquickcontrols.qch
agent:2019/08/23 13:47:41 build.go:215: Error in line 3: Namespace "" has invalid syntax in file: "/home/qt/work/build/qtbase/doc/qtquickcontrols/qtquickcontrols.qhp"
agent:2019/08/23 13:47:41 build.go:215: Makefile:694: recipe for target 'qch_docs' failed
agent:2019/08/23 13:47:41 build.go:215: make[5]: *** [qch_docs] Error 1