PreArm: Internal errors 0x1 I:959 mapfailure

I sometimes get this warning message.

PreArm: Internal errors 0x1 I:959 mapfailure

Anybody else getting this. Do you have any information of origin of it?

When this warning occur, there is not option to arm the vehicle. I can get rid of this warning just be restarting the vehicle. But I want to know more of this “warning”.

Software versions.
ArduSub: 4.1.2 (Stable)
BlueOS: 1.3.1
QGC: v4.4.2
Ping Viewer: v2.5.1