Trouble installing: unknown macro '\item'

[manesioz]

Hello, this package does not seem to be recently maintained but I thought I would raised an issue I was having.

I tried to install like so:

install.packages("devtools")
devtools::install_github('jtleek/slipper')
require('slipper'); 

But I got the following output:

Error : (converted from warning) /private/var/folders/8r/h_p6v4nd3n53wx4b4nyyvsp40000gn/T/RtmpJSIbdO/R.INSTALL172796e458749/slipper/man/slipper_ci.Rd:19: unknown macro '\item'
ERROR: installing Rd objects failed for package ‘slipper’

Any solutions to this would be really appreciated :)