Timed Out Error When Running rsDriver in Rselenium

Question

I'm trying to use RSelenium, and when I'm trying to use rsDriver, I keep getting a weird error that I'm not sure how to handle. My code is as follows:

library(RSelenium)
library(rvest)
library(XML)

rD <- rsDriver(port = 4567L, browser = "chrome")
remDr <- rD$client

As I'm running the code, I get the following error:

checking Selenium Server versions:
BEGIN: PREDOWNLOAD
BEGIN: DOWNLOAD
BEGIN: POSTDOWNLOAD
checking chromedriver versions:
BEGIN: PREDOWNLOAD
BEGIN: DOWNLOAD
BEGIN: POSTDOWNLOAD
checking geckodriver versions:
BEGIN: PREDOWNLOAD
BEGIN: DOWNLOAD
BEGIN: POSTDOWNLOAD
checking phantomjs versions:
BEGIN: PREDOWNLOAD
BEGIN: DOWNLOAD
BEGIN: POSTDOWNLOAD
[1] "Connecting to remote server"

Selenium message:Timed out waiting for driver server to start.
Build info: version: '4.0.0-alpha-2', revision: 'f148142cf8', time: '2019-07-01T21:30:10'
System info: host: 'Stephens-MacBook-Pro.local', ip: '2601:647:5680:6250:0:0:0:e510%en0', os.name: 'Mac OS X', os.arch: 'x86_64', os.version: '11.5.2', java.version: '1.8.0_333'
Driver info: driver.version: unknown

Could not open chrome browser.
Client error message:
     Summary: UnknownError
     Detail: An unknown server-side error occurred while processing the command.
     Further Details: run errorDetails method
Check server log for further details.

Any advice as to what the error might be would be greatly appreicated!