2005 Chevy Colorado roter

I'm trying to remove the roter, The roter is behind the lug bolt plate.The lug bolt plate is in the way. I took off the caliper,the mounting that holds the pads, the 6 bolts holding the roter and lug bolt plate together and also the 4 bolts on the back by the speed sensor. The lug bolt plate will not come off. I tapped lightly on it but it won't come off. WHAT am I doing wrong, WHAT is holding it from coming off. All the manuals say to remove the hub/speed sensors, but it is not budging. PLEASE HELP!!!