[Discuss-gnuradio] Problem in implementing MIMO using GRC

Hello everyone!
I am trying to implement MIMO using GRC..I always get some attribute
errors.I would like to know what all images need to be burnt on to the SD
card along with latest image of UHD..
Secondly When I try to run the command ./multi_usrp_oscope.py -h I get the
error saying ImportError: No module named _usrp_swig
Thank you very much for the help in advance.

:~/gnuradio/gnuradio-examples/python/multi_usrp> ./multi_usrp_
multi_usrp_oscope.py multi_usrp_rx_cfile.py
:~/gnuradio/gnuradio-examples/python/multi_usrp> ./multi_usrp_oscope.py -h
Traceback (most recent call last):
File "./multi_usrp_oscope.py", line 26, in <module>
from gnuradio import usrp
File "/usr/local/lib/python2.6/site-packages/gnuradio/usrp/__init__.py",
line 25, in <module>
from usrp_swig import *
File "/usr/local/lib/python2.6/site-packages/gnuradio/usrp/usrp_swig.py",
line 6, in <module>
import _usrp_swig
ImportError: No module named _usrp_swig

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