[QUERY] I'm getting Error in parse_url(url) : length(url) == 1 is not TRUE when trying to use propeR functions

[andrew-kelly-4187]

I am trying to use propeR to find the walking distance between a set of postcodes and a list of bus stops. I have the OTP server installed (using OpenTripPlanner) and it correctly gives walking routes between two points in the browser interface.

However, when I try to use any of the properR functions I get the following:

pointToPointNearest(output.dir = "D:\Data Science Stuff\TRACC replacement with PropeR\GreaterLondonOutput",
otpcon = otpcon,
originPoints = postcodes_2018_London,
destinationPoints = railstops_London,
journeyReturn = F,
modes = 'WALK',
nearestNum = 1,)
Now running the propeR pointToPointNearest tool.
Parameters chosen:
KNN nearest number: 1 (2584 calls)
Return Journey: FALSE
Date and Time: 2020-04-15 14:45:44
Creating 2584 point to point connections, please wait...
Error in parse_url(url) : length(url) == 1 is not TRUE

Unfortunately I can find nothing about this error anywhere, so I turn to you for help!

I am running R version 3.6.3, R Studio version 1.2.5042, and am doing this on a Windows 10 machine with 8GB RAM.