Maybe you are making a typo, because there is no rchart package on CRAN
as_tibble(findPackage("rchart"))
#>
#> 2 out of 13866 CRAN packages found in 11 seconds.
#> # A tibble: 2 x 5
#> SCORE NAME DESC_SHORT DOWNL_TOTAL GO
#> <dbl> <chr> <chr> <S3: formattable> <fct>
#> 1 100 flexclust Flexible Cluster Algorithms NA 3866
#> 2 100 radarchart Radar Chart from 'Chart.js' NA 9567
Maybe you want rCharts available on github
require(devtools)
install_github('ramnathv/rCharts')