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I finally could download and install the swirl package but when I want to load it using library (swirl) it gives the following message package ?swirl? successfully unpacked and MD5 sums checked The downloaded binary packages are in C:\Users\Emdad notebook\AppData\Local\Temp\RtmpEJyZTB\downloaded_packages > library(swirl) Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]) : there is no package called ?R6? Error: package or namespace load failed for ?swirl? what should I do now? From: dastjerdi1974...