if not self.selector in [0,1]:
err.append('Selector: invalid (%s is not one of 0 or 1)' % self.selector)
if not self.mtype in [0,1,2]:
if not self.selector in [0,1]:
err.append('Selector: invalid (%s is not one of 0 or 1)' % self.selector)
if not self.mtype in [0,1,2]: