The following message occurs while running the post processing module -

$ postproc.py its2D.vtk
********************************************************************************
WARNING: Imported VTK version (5.8) does not match the one used
         to build the TVTK classes (5.6). This may cause problems.
         Please rebuild TVTK.
********************************************************************************

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:\src\sfepy\sfepy\postprocess\__init__.py", line 1, in <module>
    from viewer import Viewer, ViewerGUI
  File "c:\src\sfepy\sfepy\postprocess\viewer.py", line 33, in <module>
    from sfepy.postprocess.utils import mlab
  File "c:\src\sfepy\sfepy\postprocess\utils.py", line 14, in <module>
    mlab = mayavi.mlab
AttributeError: 'module' object has no attribute 'mlab'