No ap_message for mavlink id (271)

Please tell me what this message means.: No ap_message for mavlink id (271) .Which error needs to be fixed?

Known issue for 1MB-flash boards. Fix is in dev and is marked for backport to 4.6
GCS_Common: fix missing #if for CAMERA_FOV_STATUS by robertlong13 · Pull Request #29339 · ArduPilot/ardupilot