I get the error: error in ogrlistlayers(dsn = dsn) : cannot open data source when I try to run the program below: wmap <- readOGR(dsn="~/R/funwithR/data/ne_110m_land", layer="ne_110m_land") ne_110m_land.dbf ne_110m_land.prj ne_110m_land.shp ne_110m_land.shx ne_110m_land.VERSION.txt ne_110m_land.README.html The error appears ...