Error importing OSM map tiles into R in Windows

Question

This code works fine on a Macbook, but fails on my Windows desktop with the error:

Error in raster(x) : 
      error in evaluating the argument 'x' in selecting a method for function 'raster': Error: 'merge' is not an exported object from 'namespace:raster'

Any ideas what's causing it?

Full code:

> require(OpenStreetMap)
Loading required package: OpenStreetMap
Loading required package: rJava
Loading required package: raster
Loading required package: sp
Loading required package: rgdal
rgdal: version: 0.8-11, (SVN revision 479M)
Geospatial Data Abstraction Library extensions to R successfully loaded
Loaded GDAL runtime: GDAL 1.9.2, released 2012/10/08
Path to GDAL shared files: C:/Users/Robin/Documents/R/win-library/3.0/rgdal/gdal
GDAL does not use iconv for recoding strings.
Loaded PROJ.4 runtime: Rel. 4.7.1, 23 September 2009, [PJ_VERSION: 470]
Path to PROJ.4 shared files: C:/Users/Robin/Documents/R/win-library/3.0/rgdal/proj
> lat <- c(51.7, 51.3); lon <- c(-0.53, 0.3)
> map <- openproj(openmap(c(lat[1],lon[1]),c(lat[2],lon[2]), 8, 'osm'))
Error in raster(x) : 
  error in evaluating the argument 'x' in selecting a method for function 'raster': Error: 'merge' is not an exported object from 'namespace:raster'

Answer 1

Its a bug in raster related to the method used to merge tiles - either upgrade or at a pinch use mergeTiles=FALSE.