Error after compiling grc

hi ,
i am working on GNURadio . after compiling i am getting the error . will
some tell me what this error is related to.
please check attachment for top_block.py file

Traceback (most recent call last):
File “/home/jagdish/top_block.py”, line 54, in
tb = top_block()
File “/home/jagdish/top_block.py”, line 29, in init
self.comedi_source_s_0 = comedi.source_s()
AttributeError: ‘module’ object has no attribute ‘source_s’