It's failing on the macro pass.

Drop a copy of PBPUSB18.MAC into your C:\PBP\USB18 directory.

From the DOS prompt change dir to C:\PBP\USB18

Enter: pbpw -v -ampasmwin -p18f2455 USBMOUSE at the DOS prompt. That should take care of it for now, but you might still want to drop MeLabs tech support an email.