ok i had this problem as well and i was able to fix it i can't seem to be able to find the thread for it

but how i fixed it is yes you need to replace the motion in the common file but you need to make sure that your xml file has the path written in it for the common file the one that had downloaded which was for the stage expansion and it only had the paths written for: common2, common3, common4, and common5 but not the common.pac so try editing your xml