What does this mean in lme4: function 'dataptr' not provided by package 'Rcpp'

Question

I\'m trying to do LMM using lme4, and this message pops up:

Error in initializePtr() : function \'dataptr\' not provided by package \'Rcpp\'

What should

Answer 1

After a while, I got it.

1) Reinstall the latest version of Rcpp is the solution.

2) If you are not using lme4, but you also have this problem ("function 'dataptr' not provided by package 'Rcpp'") in combination with dyn.load(), it might be worth noting do not forget to include

library(Rcpp)

or

require(Rcpp)

on your code before

dyn.load("your_shared_lib.so")

Source: building_shared_libs_with_Rcpp