Hi, and welcome!
The installation differs by operating system. Could you open regular R and run this? The output will pinpoint information that will be useful.
sessionInfo()
#> R version 3.6.2 (2019-12-12)
#> Platform: x86_64-apple-darwin15.6.0 (64-bit)
#> Running under: macOS Catalina 10.15.2
#>
#> Matrix products: default
#> BLAS: /Library/Frameworks/R.framework/Versions/3.6/Resources/lib/libRblas.0.dylib
#> LAPACK: /Library/Frameworks/R.framework/Versions/3.6/Resources/lib/libRlapack.dylib
#>
#> locale:
#> [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
#>
#> attached base packages:
#> [1] stats graphics grDevices utils datasets methods base
#>
#> loaded via a namespace (and not attached):
#> [1] compiler_3.6.2 magrittr_1.5 tools_3.6.2 htmltools_0.4.0
#> [5] yaml_2.2.0 Rcpp_1.0.3 stringi_1.4.3 rmarkdown_2.0
#> [9] highr_0.8 knitr_1.26 stringr_1.4.0 xfun_0.11
#> [13] digest_0.6.23 rlang_0.4.2 evaluate_0.14
Created on 2019-12-29 by the reprex package (v0.3.0)