Can't install cytofkit

[rachel662]

Hi there,
I'm trying to run the cytofkit package however I can't for some reason, can anyone help? I've pasted my code below

install.packages("devtools")
--- Please select a CRAN mirror for use in this session ---
trying URL 'https://cran.ma.imperial.ac.uk/bin/macosx/el-capitan/contrib/3.6/devtools_2.2.2.tgz'
Content type 'application/x-gzip' length 348682 bytes (340 KB)

downloaded 340 KB

The downloaded binary packages are in
/var/folders/w9/rgff1n4j2hv2rdgkqzh38gb00000gn/T//Rtmplecnxm/downloaded_packages

devtools::install_github("JinmiaoChenLab/cytofkit")
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’