Dear Juan,
Sorry for the bug, it should be fixed now.
The problem with the REPLACEMENT might be due to two reasons:
a) you should use Python 3 beacuse of simpler unicode support,
b) there is something in your latex files, that I didn't expect writing
my parser. I such case, please do send me your file (if it is possible)
and I'll try to fix the parser.
Argparse is/was an external module, but is going to be in the Python
Standard Library from Python 3.2 on.
Cheers,
Asia