yaw after takeoff

my copter turns a little bit to left after takeoff. i found this in the wiki: "My copter spins right or left 15° when I take off: Your Motors are not straight or your ESCs are not calibrated. Twist the motors until they are straight. Run the ESC calibration routine." the motors look ok if theres a less than 1-2 deg margin error allowed. When i try to calibrate escs (turnigy plush18) the motor on 3rd output keeps beeping. I hawe to pull out the one at the 4th, connect the third there and rerun the callibration process. tried it many times. is it possible that this could be the cause?

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