[R] error building package: packaging into .tar.gz failed

[Juliet Hannah]

I am trying to build a package using windows xp. Here is the error I am getting:

R CMD build myfunctions

* checking for file 'myfunctions/DESCRIPTION' ... OK
* preparing 'myfunctions':
* checking DESCRIPTION meta-information ... OK
* checking for LF line-endings in source and make files
* checking for empty or unneeded directories
* building 'myfunctions_1.0.tar.gz'
 ERROR
packaging into .tar.gz failed

Could anyone suggest possible things to check? Thanks.

> sessionInfo()
R version 2.13.0 (2011-04-13)
Platform: i386-pc-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United
States.1252    LC_MONETARY=English_United States.1252 LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

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