R help - Nov 2011 - Warning message interpretation

Using the rmarketdata package and getting a warning message. 

What does this warning message tell me ? What could I do to eliminate or
address it ?

require(rdatamarket)
Loading required package: rdatamarket
Loading required package: zoo


Warning message:
In assignInNamespace("as.Date.numeric", function(x, origin, ...) { :
  binding of ?as.Date.numeric? is locked and will not be changed

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On 11-11-07 8:08 PM, eric wrote:
> Using the rmarketdata package and getting a warning message.
>
> What does this warning message tell me ? What could I do to eliminate or
> address it ?
>
> require(rdatamarket)
> Loading required package: rdatamarket
> Loading required package: zoo
>
>
> Warning message:
> In assignInNamespace("as.Date.numeric", function(x, origin, ...)
{ :
>    binding of ?as.Date.numeric? is locked and will not be changed
It says one of the packages tried to change an object in another 
package, which is not allowed.

Duncan Murdoch