FFanalytics download error

General
,
#1

I am unable to download ffanalytics from github.

The first one ran successfully:
install.packages(c("devtools","rstudioapi"), dependencies=TRUE, repos=c("http://rstudio.org/_packages", "http://cran.rstudio.com"))

An error occurred while running second one:

devtools::install_github(repo = "FantasyFootballAnalytics/ffanalytics", build_vignettes = TRUE,checkBuilt=TRUE)

Following error is shown:
Error: .onLoad failed in loadNamespace() for 'pkgload', details:
call: loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]])
error: there is no package called ‘backports’

Please help me.

#2

Have you tried installing the missing dependency?

install.packages("backports")
#4

It's working now.
package named "ellipsis" needs to be installed.
Thanks for support

#3

Done!

But now the error is: please help

WARNING: Rtools is required to build R packages, but the version of Rtools previously installed in C:/rtools40 has been deleted.

Please download and install Rtools custom from http://cran.r-project.org/bin/windows/Rtools/.
Downloading GitHub repo FantasyFootballAnalytics/ffanalytics@master

#5

The error message is self explanatory, you need to install and configure RTools40 in your system. Click on the link and follow instructions there.

#6

Rtools40 was already installed.

However, package named "ellipsis" was not installed.

After installing, library ffanalytics was successfully installed.

Thank you.