[R-sig-Geo] could not find function "checkCRSArgs"

[olga lyashevska]

require(maptools)
require(rgdal)

borders<-readShapePoly("./borders.shp", proj4string=CRS("+init=epsg:4326"))
Error in CRS("+init=epsg:4326") : could not find function "checkCRSArgs"

Any clues what might cause this?

Many thanks,
Olga



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