R help - Nov 2009 - Error in describe Unused Argument(s)

I'm using the describe function in (Hmisc) with survey data.

When I run this command: describe(NCS,weights=NCS$w1)

I get this error message:

Error in describe(NCS, weights = NCS$w1) : 
  unused argument(s) (weights = c(2.49460916442049,...

Do you know why it is not using the weights argument?
  
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