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AttributeError Traceback (most recent call last)
<ipython-input-16-c985c6423e2d> in <module>()
 7 #F='C:\Users\Prashant\Documents\IPython Notebooks\resources\ch06-mailboxes'
 8 F='resources/ch06-mailboxes/data/enron.mbox.json.bz2'
----> 9 r = envoy.run("bunzip2 %s" % (F,))
 10 print r.std_out
 11 print r.std_err
C:\Anaconda\lib\site-packages\envoy\core.py in run(command, data, timeout)
 166 
 167 cmd = Command(c)
--> 168 out, err = cmd.run(data, timeout)
 169 
 170 r = Response(process=cmd)
C:\Anaconda\lib\site-packages\envoy\core.py in run(self, data, timeout)
 51 self.process=process;
 52 thread.join()
---> 53 self.returncode = self.process.returncode
 54 return self.out, self.err
 55 
AttributeError: 'NoneType' object has no attribute 'returncode'