VX3 problem and Uart connection failure

Hi
I couldn’t make the Uart connection. I think I messed up some settings.
remote control reverse throttle not working and Real time speed not responding
what could be the problem?
and

via GIPHY

RU

first check for n your VESC Tool if you set in App the UART.
After check in the VX3 remote if you set it to VESC or FSESC mode.
When still not working, change Rx with the Tx and the Tx to the Tx between Receiver and VESC.

the remote control is set to FESC.
I will do what you say and let you know the result.

it gives this error