Urgent: Test code after wiring is not working [Errno 2] No

sudo python testSDL_Pi_TCA9545.py

Test SDL_Pi_TCA9545 Version 1.0 - SwitchDoc Labs

Sample uses 0x73
Program Started at:2017-11-13 05:02:38

Traceback (most recent call last):
File "testSDL_Pi_TCA9545.py", line 51, in <module>
tca9545 = SDL_Pi_TCA9545.SDL_Pi_TCA9545(addr=TCA9545_ADDRESS, bus_enable = TCA9545_CONFIG_BUS0)
File "/home/pi/Desktop/SDL_Pi_GroveWeatherPi-master/SDL_Pi_TCA9545/SDL_Pi_TCA9545.py", line 44, in _init_
self._bus = smbus.SMBus(twi)
IOError: [Errno 2] No such file or directory