edited utils.py-
if mayavi:
    import mayavi.mlab as mlab
from mayavi.core.source import Source
from mayavi.core.filter import Filter
    import dataset_manager

error-

$ postproc.py its2D.vtk
Traceback (most recent call last):
  File "./postproc.py", line 8, in <module>
    from sfepy.postprocess import Viewer, get_data_ranges, create_file_source
  File "c:\sfepy\sfepy\postprocess\__init__.py", line 1, in <module>
    from viewer import Viewer, ViewerGUI
  File "c:\sfepy\sfepy\postprocess\viewer.py", line 22, in <module>
    from tvtk.pyface.scene_editor import SceneEditor
  File "c:\Python27\lib\site-packages\tvtk\pyface\scene_editor.py", line 12, in
<module>
    SceneEditor = toolkit_object('scene_editor:SceneEditor')
  File "c:\Python27\lib\site-packages\tvtk\pyface\toolkit.py", line 92, in toolk
it_object
    __import__(be_mname)
  File "c:\Python27\lib\site-packages\tvtk\pyface\ui\wx\scene_editor.py", line 2
7, in <module>
    from decorated_scene import DecoratedScene
  File "c:\Python27\lib\site-packages\tvtk\pyface\ui\wx\decorated_scene.py", lin
e 29, in <module>
    from tvtk.api import tvtk
  File "c:\Python27\lib\site-packages\tvtk\api.py", line 11, in <module>
    from tvtk.tvtk_access import tvtk
  File "c:\Python27\lib\site-packages\tvtk\tvtk_access.py", line 37, in <module>

    import vtk
  File "c:\Python27\lib\site-packages\vtk\__init__.py", line 88, in <module>
    __helper.refine_import_err('charts', 'vtkChartsPython', exc)
  File "c:\Python27\lib\site-packages\vtk\__helper.py", line 32, in refine_impor
t_err
    raise LinkError, str(exc)
vtk.__helper.LinkError: DLL load failed: The specified module could not be found
.