Что не так с QT Creator и что я не могу его запустить?

Я не могу запустить QT Creator. Когда я запускаю его, появляется следующая ошибка.

(qtcreator:8508): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(qtcreator:8508): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(qtcreator:8508): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
(qtcreato:8508): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
Connected to accessibility bus at:  "unix:abstract=/tmp/dbus-Ih3kweFmKu,guid=af07d35df387caee7e8705270000001a" 
Registered DEC:  true 
Invalid parent:  0xa4f5b78 SharedTools::QtSingleApplication(0xbfee5be0, name = "qtcreator") 
Requesting child objects for an interface that is a virtual child itself. 
Requesting child objects for an interface that is a virtual child itself. 
Requesting child objects for an interface that is a virtual child itself. 
Requesting child objects for an interface that is a virtual child itself. 
Requesting child objects for an interface that is a virtual child itself. 
Requesting child objects for an interface that is a virtual child itself. 
Requesting child objects for an interface that is a virtual child itself. 
Requesting child objects for an interface that is a virtual child itself. 
Requesting child objects for an interface that is a virtual child itself. 
Requesting child objects for an interface that is a virtual child itself. 
QSpiAdaptor::getChild INVALID CHILD:  QWidget(0xa661398, name = "qt_scrollarea_viewport") 2 
ASSERT: "interface->childCount() == children.count()" in file adaptor.cpp, line 200
Aborted