ALERT Reset switches

When I turn on my turnigy 9XR pro I get an alert that says to reset switches. That a switch is in the wrong position. The screen on the transmitter shows an E with a down arrow. The elevator switch doesn’t seem to be working at all. Checked inside and could not find any obvious wiring problems. Can anyone give me any answers about this issue. Additionally, when you are on the transmitter screen that shows each switch light up as you turn each one on and off. The elevator switch does nothing. I don’t understand why the elevator shows up as E with a down arrow. Help Please!