SSL certificate problem: self signed certificate in certificate chain

[DChen721]

Hi, I'm basing my code off of this setup code: https://github.com/Tatvic/RGoogleAnalytics/blob/master/demo/data_extraction_demo.R

When I try running it sometimes, I'll get this error:

> ValidateToken(token)
Error in curl::curl_fetch_memory(url, handle = handle) : 
  SSL certificate problem: self signed certificate in certificate chain

Has anyone else run into this? I'm new to using R for API-related purposes, so if someone could help point me to a workaround for this I'd be very thankful!