from esys.lsm.vis import povray

Hi there.
I am getting an error because "no modul found esys.lsm.vis" when I am loading "from esys.lsm.vis import povray", and I have not found this package in this folder either. But I have also installed "povray and vtk". would like to ask how this package should be installed. Or is there something wrong with my software's environment settings. Thanks for your help!