Run a reproducable solution

I try to run these command which are from this:

library(bibliometrix)
# Loading txt or bib files into R environment
D <- readFiles("http://bibliometrix.org/datasets/joi.txt")

# Converting the loaded files into a R bibliographic dataframe
M <- convert2df(D, dbsource="isi",format="plaintext")

However I receive this error:

Error in seq.default(iStart, iStop) : 'from' must be a finite number

How can I fix it from this reproducable example to continue?