Fettec build with tracer .

I have several drones built that I put away for a couple years. I just bought DJI system and stepped away. So I picked it back up and decided to fly again. I sold my old tango 2 and still have my mamba .. I cannot get my quad to arm using alpha firmware with tracer. I'm getting Rx failsafe mode in Google's  I have my failsafe set to cut .. not sure what else to do