GroveWeatherPi Initial Test failure

I receive the following error when runs the initial TCA9545 test:

Test SDL_Pi_TCA9545 Version 1.0 Switchdoc Labs

Sample uses 0x73
Program Started at:2018-11-17 16:21:52

Trackback (most recent call last):
File 'testSDL_Pi_TCA9545.sld_Pi-master/SDL-Pi_TCA9545(addr=TCA9545_ADDRESS, bus_enable = T
CA9545_CONFIG_BUS0)
File "/home/pi/SDL_Pi_GroveWeatherPi-master/SDL_Pi__TCA9545/SDL_Pi_TCA9545.py",
line 44, in _init_
self._bus = sambas.SMBus(twi)
IOError: [Errno 2] No such file or directory


I have checked and rechecked the wiring and still receive the same error message.

Any help would be appreciated.