Bad channel 1 input in mission planner

Hi all, I’ve run into a issue on my 250 build. I cannot get the gui to show any response to the TX while calibrating. I’m using a Turnigy 9xrpro, DJT module and a Delta 8 receiver setup with PPM. I bind the Rx and the Tx, the Rx shows a steady green light but no response in the Tx calibration part of mission planner. I am able to get a gps lock, setup the accelerometer but receive Bad channel 1 input after hitting complete. Im wondering if my Pixfalcon is faulty. All suggestions are appreciated.