Pyper error: [WinError 2] The system cannot find the file specified

I'm trying to work with the pyper library in Python. I've been following along with the example here, but I keep running into an error. It doesn't seem like the pyper library is working for me at all.

import pandas as pd
import pyper as pr

r = pr.R(use_pandas = True)

I get the following error: [WinError 2] The system cannot find the file specified

I'm running it in a Juypter environment on Python 3. Not sure if that makes a difference.

from Pyper error: [WinError 2] The system cannot find the file specified