No module named _gnuradio_swig_py_runtime

Hi All,
I got problem when I ran an example dial_tone.py on Cygwin.
Here is an error:
HP@hp-0a197361383d /usr/src/gnuradio-3.2/gnuradio-examples/python/audio
$ python dial_tone.py
Traceback (most recent call last):
File “dial_tone.py”, line 23, in
from gnuradio import gr
File “/usr/lib/python2.5/site-packages/gnuradio/gr/init.py”, line
43, in <
module>
from gnuradio_swig_python import *
File
“/usr/lib/python2.5/site-packages/gnuradio/gr/gnuradio_swig_python.py”,
l
ine 23, in
from gnuradio_swig_py_runtime import *
File
"/usr/lib/python2.5/site-packages/gnuradio/gr/gnuradio_swig_py_runtime.py
", line 6, in
import _gnuradio_swig_py_runtime
ImportError: No module named _gnuradio_swig_py_runtime

Please help me to solve this problem. I don’t know how to fix this
error.
Thanks in advance!

Ngo Dinh Thanh
Lecturer of The Faculty of Electrical Engineering
Danang University of Technology

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