Copter simulation issue with a message "PreArm: Motor Interlock Enabled"

I’m using copter simulation.

Suddenly, I got a message “PreArm: Motor Interlock Enabled”.
And I cannot Arm the copter in the simulation.
This has not happened before.
Today, I encountered it.
I am a very begginer about Copter and MISSION PLANNER.
Please give me a solution.

Thank you.


There is an issue in Mission Planner, it should be corrected soon.

reference issue :

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It should be fixed now !

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