ESC Castle Creations ESC won't arm; motor makes clicking/knocking sound

helicc16

the Smoothie Pilot
Hi, guys. The suspect this time is a Castle Creations Phoenix HV 120A ESC (installed on my 700). I can program it normally using the Castle Link Software, but the ESC now won't arm and instead of beeping the motor makes soft knocking sound ( as if you are tapping on a wooden surface with your fingernail). I have done the following checks:
-signal wire connection to the AR7200BX: correct and secure
-the motor battery pack: full

In addition, I also updated the firmware and connected the ESC to a different motor. So far I am still stuck.
 
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