Bug in raster::crop? - solved

I should add that I get this also when loading R with the --vanilla
flag.

Julian M. Burgos writes:

Hello everyone,

I am getting this error when using the crop function in the raster
package.  Here is an example, sing the example in the help file:

r <- raster(nrow=45, ncol=90)
r[] <- 1:ncell(r)
e <- extent(-160, 10, 30, 60)
rc <- crop(r, e)

Error in extent(extent) : insufficient number of elements (should be 4)

I am using R version 3.4.4., and raster 2.6-7.

Many thanks,

Julian