I am having an error when typing in the command 'frame-relay switching' to enable it at the global config mode FrameRelay(config)#frame-relay switching ^ % Invalid input detected at '^' marker. FrameRelay(config)#interface s2/...

I am unable to ping the default gateway and other devices, however i am able to ping the loopback ip from the computers/laptops, i have attached the packet tracer file to this discussion