I am compiling the ArduPilot source code, there is no module named uavcan error, how to solve it? thanks

ArduCopter Copter 4.0
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1

I am compiling the ArduPilot source code, there is no module named uavcan error, how to solve it? thanks，

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This is likely related to the submodule change like in you other post, ARDUPILOT FETCH UPSTREAM compiled error