ImportError: No module named pw_material

[uid89626]

import gmes
No module named psyco. Execution speed might be slow.
Traceback (most recent call last):
File "", line 1, in
File "/usr/local/lib/python2.7/dist-packages/gmes/init.py", line 51, in
from fdtd import *
File "/usr/local/lib/python2.7/dist-packages/gmes/fdtd.py", line 25, in
from file_io import Probe
File "/usr/local/lib/python2.7/dist-packages/gmes/file_io.py", line 23, in
from pw_material import MaterialElectricReal, MaterialElectricCmplx
ImportError: No module named pw_material

[yu-ting-py]

After I use cmd to install your package, it apprears
running install
running build
running build_py
creating build
creating build\lib.win-amd64-3.6
creating build\lib.win-amd64-3.6\gmes
copying gmes\fdtd.py -> build\lib.win-amd64-3.6\gmes
copying gmes\file_io.py -> build\lib.win-amd64-3.6\gmes
copying gmes\geometry.py -> build\lib.win-amd64-3.6\gmes
copying gmes\pw_source.py -> build\lib.win-amd64-3.6\gmes
copying gmes\show.py -> build\lib.win-amd64-3.6\gmes
copying gmes\source.py -> build\lib.win-amd64-3.6\gmes
copying gmes_init_.py -> build\lib.win-amd64-3.6\gmes
running build_ext
building 'gmes._pw_material' extension
swigging src\pw_material.i to src\pw_material_wrap.cpp
swig.exe -python -c++ -outdir gmes -o src\pw_material_wrap.cpp src\pw_material.i
error: command 'swig.exe' failed: No such file or directory

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Could anyone tell me how to fix it?

Thanks in advance.