Take a look at the "array_handler.py" file. In line 29
29 from tvtk.array_ext import set_id_type_array
There is no folder called "tvtk" in the folder were "array_handler.py" is running, as we are already inside a folder called tvtk. So the code should instead say:
from array_ext import set_id_type_array
The "array_handler.py" is found in your computer in
C:\...\Enthought\Canopy32\User\lib\site-packages\tvtk\array_handler.py
I had the same problem and this solved it.