[R] make.groups function of laatice is not working?

[newbie_2010]

> require(lattice) 
Loading required package: lattice
Error in library(package, lib.loc = lib.loc, character.only = TRUE,
logical.return = TRUE,  : 
  'lattice' is not a valid installed package
> library(lattice) 
Error in library(lattice) : 'lattice' is not a valid installed package
> 


I got these errors after trying them
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