def showError(self, title, text):
        
        errorWidget = QtGui.QMessageBox(self)
        errorWidget.setWindowTitle(title)
        errorWidget.setText(text)
        errorWidget.show()
Converts the xml for one vm to an ``Instance`` object.
dataset/ETHPy150Open VisTrails/VisTrails/contrib/cdat/cdat_window.py/QVariableView.showError--crossover with--dataset/ETHPy150Open bmbouter/Opus/opus/lib/prov/drivers/opennebula14.py/_xml_to_instance