Problem with one ESC/motor?

I’m starting to tune my UAV runing pixhawk and arducopter.
But, I notice that one ESC/motor don’t work like others. It does not start when arming like other 3.
Here a shor video:

Another problem is a little shake that I notice in some part of the testing flight. I can’t find the problem. I attached a log file for the video flight.

2018-05-23 (326.4 KB)

Never mind, it was an ESC calibration problem. It fligth reaaaaaallyyyyyyyy smooth now!!!

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