高手帮我看一下，脚本为什么执行了没有效？

leonmb

:global ip [ /Queue List get [/Queue List find comment="xy"]  Target Address ]
:global new-ip [:pick $ip 0 [:find $ip "/"]]
:global old-ip [/ip ARP List get [/ip ARP List find MAC Address=45:8A:CC:98:11:CA] IP Address]
:if ($new-ip != $old-ip) do={
        :log info [/Queue List set [/Queue List find comment="xy"] Target Address=$old-ip]
        :log info "〖修改完毕〗"