Hmisc describe error

Describe fails for me with a message similar to what was an issue in 2008 and got fixed according to posts.

R version 2.15.0 (2012-03-30)
Copyright (C) 2012 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: i386-pc-mingw32/i386 (32-bit)

# output truncated

options(chmhelp = FALSE, help_type = "text")
.help.ESS <- help
options(STERM='iESS', editor='gnuclient.exe')
load('prostate.sav')
library(rms)

Loading required package: Hmisc
Loading required package: survival
Loading required package: splines
Hmisc library by Frank E Harrell Jr

Type library(help='Hmisc'), ?Overview, or ?Hmisc.Overview')
to see overall documentation.

NOTE:Hmisc no longer redefines [.factor to drop unused levels when
subsetting.  To get the old behavior of Hmisc type dropUnusedLevels().


Attaching package: 'Hmisc'

The following object(s) are masked from 'package:survival':

    untangle.specials

The following object(s) are masked from 'package:base':

    format.pval, round.POSIXt, trunc.POSIXt, units


Attaching package: 'rms'

The following object(s) are masked from 'package:survival':

    Surv

describe(prostate)

Error in format(dates(x)) : could not find function "dates"

Thanks everybody.
Stephen