time series interpolation

Hi there,
I?ve got a datatable in R which I try to interpolate with this and get the
Error below:

new$temp<- approx(w03_11temp$temp, n = (nrow(w03_11temp)*5))$y

Error in new$temp <- approx(w03_11temp$temp, n = (nrow(w03_11temp) * 5))$y : 
  Object of type 'closure' not registered

Any idea?? Thanks a lot.

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