Error regarding argument count

[anmol1991]

Traceback (most recent call last):
File "/opt/rtp_cluster-master/sippy_lite/sippy/Udp_server.py", line 258, in handle_read
self.uopts.data_callback(data, address, self, rtime)
File "/opt/rtp_cluster-master/Rtp_cluster.py", line 162, in up_command_udp
return self.up_command(clim, cmd)
File "/opt/rtp_cluster-master/Rtp_cluster.py", line 170, in up_command
self.down_command('E999', clim, cmd, None)
TypeError: down_command() takes exactly 6 arguments (5 given)