PreArm: RC not calibrated error

Hi, I’m building a quadcopter with the APM2.8 flight controller but I’m unable to arm. I keep getting the “PreArm: RC not calibrated” error. Please I need help.

Please follow the instructions on the wiki to calibrate your RC receiver.

Hi, I’m trying to do that but I can’t find a suitable solution
I’ve tried recalibrating too
The thing is I had armed the drone after calibrating initially and it worked but it won’t arm again and it keeps showing that RC not calibrated error message
Do you have a link I could follow or something

Here is the Wiki for the current version of Ardcopter.
https://ardupilot.org/copter/docs/common-prearm-safety-checks.html#:~:text=and%20prevent%20arming.-,RC%20failures%3A,MAX%20value%201700%20or%20more.

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IT has nothing to do with calibration. Could be as simple as restarting your MP on your computer and reconnecting the USB…