Caught exception: <type 'exceptions.EOFError'>

[duolk]

[i] Read key: 60733844cb5186657fdedaa22b5a57d5
[i] Listening for new connection ...
[i] Got a connection from 10.2.5.206:39498
[!] *** Caught exception: <type 'exceptions.EOFError'>:
Traceback (most recent call last):
File "server.py", line 181, in
t.start_server(server=server)
File "/usr/lib/python2.7/dist-packages/paramiko/transport.py", line 655, in start_server
raise e
EOFError
Traceback (most recent call last):
File "server.py", line 275, in
delta = now - start_time
NameError: name 'start_time' is not defined

I got Error like this……