Help !

I operate a Bridgeport VMC 100 30 cnc miller.
While the arm was collecting the tool from the tool holder (carousel) it hit the tool in the wrong position and stopped the machine. the machine was powered down and reset but the arm will not go back into the home position, and the message on the display screen is reading " Tool Change Arm Break Off"
could anyone help and tell me how to get the unit back to the home position

thanks