Error: unicode argument expected, got 'str'

Hi! I'm trying to use cprofilev. I'm not a python geek. So maybe you can help me the error I'm facing.
When I launch: python -m cprofilev -p 11100 /path/to/x.py
(I used another port because 4000 was already use)
My program starts.. but if I connect to localhost:11100 during the execution I see a server error page.
My port scan see this port open.
My program lasts about 5 minutes and has a lot of print logs.

When the program has finished I see this error as well on the terminal:

Traceback (most recent call last):
File "/Users/andreapigatto/anaconda/lib/python2.7/site-packages/bottle.py", line 862, in _handle
return route.call(*_args)
File "/Users/andreapigatto/anaconda/lib/python2.7/site-packages/bottle.py", line 1732, in wrapper
rv = callback(_a, **ka)
File "/Users/andreapigatto/anaconda/lib/python2.7/site-packages/cprofilev.py", line 164, in route_handler
'stats': self.stats.sort(sort).show(func_name).read(),
File "/Users/andreapigatto/anaconda/lib/python2.7/site-packages/cprofilev.py", line 125, in show
self.stats.print_stats(restriction)
File "/Users/andreapigatto/anaconda/lib/python2.7/pstats.py", line 351, in print_stats
print >> self.stream, indent, self.total_calls, "function calls",
TypeError: unicode argument expected, got 'str'

Can you give me some tips about how to solve and what can be?

Many thanks
Andrea