now it works perfect thanks for the information.
slicer.util.loadVolume('C:/Users/aldot/Desktop/Seg30/Aldo 3/Done/IXI-nu.mgz')
slicer.util.loadLabelVolume('C:/Users/aldot/Desktop/Seg30/Aldo 3/Done/IXI-aseg.mgz', {'colorNodeID': 'vtkMRMLColorTableNodeFile'})