Have you downloaded UAE for Wiz ? http://dl.openhandhelds.org/cgi-bin/wiz.cgi?0,0,0,0,72,122
You can't use UAE for GP2X (F100/F200). For the same reason, Payback doesn't work on the Wiz (there isn't a Wiz port/conversion).
GP2X Wiz archive: http://dl.openhandhelds.org/cgi-bin/wiz.cgi