issue with MyServer.py

[rajeshkrarora1]

on giving command sudo python MyServer.py

get output as

Traceback (most recent call last):
File "MyServer.py", line 119, in
bus.write_byte(address, 0xff)
File "/usr/local/lib/python2.7/dist-packages/smbus_cffi-0.5.1-py2.7-linux-armv7l.egg/smbus/util.py", line 59, in validator
return fn(*args, **kwdefaults)
File "/usr/local/lib/python2.7/dist-packages/smbus_cffi-0.5.1-py2.7-linux-armv7l.egg/smbus/smbus.py", line 121, in write_byte
raise IOError(ffi.errno)
IOError: 121