Help needed with successfully downloading and opening Agricolae package

Hi, I just downloaded the Agricolae package and tried to access it using the commands listed below (and received the error messages in red).  Any suggestions on resolving these errors?

Thanks for your assistance.

Doug

install.packages("agricolae")

% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0100  896k  100  896k    0     0   900k      0 --:--:-- --:--:-- --:--:--  900k

The downloaded binary packages are in
/var/folders/qn/8tc0v1m971d361gv0mwsmxj80000gn/T//RtmpYMZ97k/downloaded_packages

library(agricolae)

Error in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]) :
  there is no package called ?sp?
Error: package or namespace load failed for ?agricolae?