[R-br] erro "initRefFields"

[Benilton Carvalho]

O caso abaixo funciona para mim... mas nao tenho como testar no no
2.14.1 agora. b

> library(ggmap)
> ggmapplot(ggmap('Paris', verbose = TRUE), fullpage = TRUE)
grabbing map... done.
> sessionInfo()
R Under development (unstable) (2012-01-11 r58090)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

locale:
[1] C

attached base packages:
[1] grid      stats     graphics  grDevices datasets  utils     methods
[8] base

other attached packages:
 [1] ggmap_1.2            proto_0.3-9.2        reshape2_1.2.1
 [4] plyr_1.7.1           scales_0.2.0         ggplot2_0.9.0
 [7] ReadImages_0.1.3.1   RgoogleMaps_1.1.9.15 png_0.1-4
[10] RColorBrewer_1.0-5   BiocInstaller_1.1.28

loaded via a namespace (and not attached):
[1] MASS_7.3-17      colorspace_1.1-1 dichromat_1.2-4  digest_0.5.1
[5] memoise_0.1      munsell_0.3      stringr_0.6      tools_2.15.0