Key Command to "Free Warp" not working

Hi Guys,
I’m trying to setup a KeyCommand to Free Warp Tool but I always get a message: "The Key Combination <5> assigned to the command “Free Warp Tool” is not available. 5 is the key i’m trying to assign to this command, btw.

As a workaround, I made a macro to select the comp tool and then “Select Next Tool”. It works.

Is anyone else having this same problem ?