/usr/lib/python2.3/site-packages/xen/xm/main.py line 308 should be migrate.main(args) not migrate.main(arg) /usr/lib/python2.3/site-packages/xen/xm/opts.py i couldn''t get ''xm migrate help'' to work without changing line 330 to print ''Usage: '', self.use or ''OPTIONS'' from print ''Usage: '', self.argv[0], self.use or ''OPTIONS'' but that might break something else. James