Pre arm: 3d accel calibration needed

Can anyone help with this error in mission planner please

Go here Accel calibration
In the future a simple Google search will find the wiki docs. “arducopter accel calibration”

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If you got that error then you probably skipped a lot of mandatory calibrations, and your drone will not be at it’s best behavior.

Are you willing to do the necessary work to fix all potential issues before they arrive, or do you want to save yourself the trouble in the short-term but potentially have issues in the future?