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I cannot open the Rcmdr package, some output like this popped up:

Loading required package: splines
Loading required package: RcmdrMisc
Loading required package: car
Loading required package: sandwich
Error: package or namespace load failed for 'RcmdrMisc' in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 there is no package called 'gridExtra'
Error: package 'RcmdrMisc' could not be loaded

What should I do? I have zero knowledge in R. Please help!!!!

Heikki
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