Error when using openmap function (OpenStreetMap package) in R

Question

I want to get a map based on a set of longitude and latitude coordinates using openmap.

This is the code that I'm using:

map <- openmap(c(43.46886761482925,119.94873046875),
    c(33.22949814144951,133.9892578125),
        minNumTiles=4)

I'm getting this error:

Error in if (substring(type, 1L, 4L) == "http") type else match.arg(type) : 
  the condition has length > 1