[Serusers] Mediaproxy Problem

Hi. When i try to make a call in a NAT enviroment i get the next error in the debug from my SER. 1(2825) error: mediaproxy/sendMediaproxyCommand(): can't connect to MediaProxy I guess this is because the mediaproxy is not running, but i followed all the steps in the INSTALL file to start the mediaproxy. I used : /etc/init.d/mediaproxy start and even [root@sipproxy mediaproxy]# ./mediaproxy.py File "./mediaproxy.py", line 84 print >>sys.stderr, "Mediaproxy error: %s. Exiting." % why ^ SyntaxError: invalid syntax [root@sipproxy mediaproxy]# But i can't see any "mediaproxy" process running. Any ideas? Any help will be accepted. Thanks in advance. Ricardo