legend_position inconsistent

The help file states that the legend_position can be in the following positions...
`legend_position | "none", "top", "left", "right" or "bottom" (defaults to "top")`
But, if I add legend_position = "right" to my statebins_continuous() call, I get the following error:

> Error in statebins_continuous... 'legend_position' must be either blank, 'none', 'top' or 'bottom'



