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•  Was the code saved and then was make  run?
•  Is the branch you're on the correct one?
  •  Solution: switch to branch you were working on.
•  If using a different board, is BPS power plugged in?
  •  Solution: BPS (supplemental) power is located near the GPIO inputs for the rotary switch (7x2) where it's labeled BPS Pwr. 

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LOOPBACK

•  If running on LOOPBACK, are the messages being acknowledged? 
  •  Solution: use CANadapter
•  If running on LOOPBACK, did you run make clean and then make again?