[R] Confused about loading other packages from a package

[hadley wickham]

Unfortunately, marrayClasses doesn't seem to have a namespace:

> library(maVis)
Error in loadNamespace(imp[[1]], c(lib.loc, .libPaths()), keep.source) : 
        package 'marrayClasses' does not have a name space
Error in library(maVis) : package/namespace load failed

Any other ideas?

Hadley