HTTP 400 Bad Request

library(ggplot2)
library(ggmap)
ggmap::register_google(key = " ")
qmap('Liverpool')
its giving error
Error in aperm.default(map, c(2, 1, 3)) :
invalid first argument, must be an array
In addition: Warning message:
In get_googlemap(center = location, zoom = zoom, maptype = maptype, :
HTTP 400 Bad Request

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