[R] Warning message interpretation

[eric]

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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