Swap Gateways

I am trying to use the below script it will do everything until it gets to the second /ip route command and will not process this one. Can soneone help where I am going wrong.

:log info “PACNET MPLS down Enable NEXTG wait then ENABLE VPN”;
/interface ppp-client enable 0;
delay 15s;
/interface pptp-client enable 0;
/ip route set [find comment=“Default Gateway”] disabled=yes};
/ip route set [find comment=“VPN Gateway”] disabled=no};