Error in CRS("+init=epsg:4326")

I'm having the following issue. It's been quite a while I do not play with this program, but it seems that something is not where it should be. Is there any thing I can do to fix it??

# packages:?
library(ggmap)
library(sp)
library(rgdal)
library(rgeos)
?
?# get the city coordinates
go <- geocode("Chicago")
# create spatialPoint object
coordinates(go) <- ~ lon + lat
proj4string(go) <- CRS("+init=epsg:4326")
Error in CRS("+init=epsg:4326") : no system list, errno: 2
?
EPSG <- make_EPSG()
Error in make_EPSG() : Error opening epsg file

sessionInfo()

R version 3.2.0 (2015-04-16)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.10.3 (Yosemite)

locale:
[1] en_CA.UTF-8/en_CA.UTF-8/en_CA.UTF-8/C/en_CA.UTF-8/en_CA.UTF-8

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

other attached packages:
[1] rgeos_0.3-8 ? rgdal_0.9-2 ? sp_1.1-0 ? ? ?ggmap_2.4 ? ? ggplot2_1.0.1

loaded via a namespace (and not attached):
?[1] Rcpp_0.11.5 ? ? ? ? magrittr_1.5 ? ? ? ?maps_2.3-9 ? ? ? ??
?[4] MASS_7.3-40 ? ? ? ? munsell_0.4.2 ? ? ? colorspace_1.2-6 ??
?[7] geosphere_1.3-13 ? ?lattice_0.20-31 ? ? rjson_0.2.15 ? ? ??
[10] jpeg_0.1-8 ? ? ? ? ?stringr_1.0.0 ? ? ? plyr_1.8.2 ? ? ? ??
[13] tools_3.2.0 ? ? ? ? grid_3.2.0 ? ? ? ? ?gtable_0.1.2 ? ? ??
[16] png_0.1-7 ? ? ? ? ? digest_0.6.8 ? ? ? ?RJSONIO_1.3-0 ? ? ?
[19] reshape2_1.4.1 ? ? ?mapproj_1.2-2 ? ? ? stringi_0.4-1 ? ? ?
[22] RgoogleMaps_1.2.0.7 scales_0.2.4 ? ? ? ?proto_0.3-10 ? ?




\begin{signature}
Daniel Marcelino
??dm.silva at umontreal.ca?
? (514) 343 6111 #3799
Skype: d.marcelino?
? 3200 Jean Brillant, ?Office C5071
Montreal, QC; H3T 1N8
Canada
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