APM 1.4 'ap' was not declared in this scope

Hi all, 

I am trying to program the board to fly with X-plane.

I did the configuration for the sketchbook, but I still get the following error message from Arduino:

AP_State.pde: In function 'void set_home_is_set(bool)':

AP_State:6: error: 'ap' was not d

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