getdirections_box/latlons/nn|nn does not work

In readme it says:

If you have the Colorbox module installed and enabled in Get Directions
you can place any of the above paths in a colorbox iframe by replacing
'getdirections' with 'getdirections_box'.
To enable this for a link you can use the 'colorbox-load' method,
make sure that this feature has been enabled in colorbox

when I change getdirections/latlons/nn|nn to getdirections_box/latlons/nn|nn the to and from fields are not filled in