Dropbox "error reading source directory"

Same errors (for different directories). The Dropbox has around 180k files, and similarly generated 10 errors which is the same as the previous run.

2020/06/28 20:34:03 ERROR : DIRECTORYPATH: error listing: <!DOCTYPE html>
<html>
<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Dropbox - 4xx</title>
<link href="https://cfl.dropboxstatic.com/static/css/error.css" rel="stylesheet" type="text/css"/>
<link rel="shortcut icon" href="https://cfl.dropboxstatic.com/static/images/favicon.ico"/>

2020/06/28 20:49:56 DEBUG : 3 go routines active
2020/06/28 20:49:56 Failed to size with 10 errors: last error was: <!DOCTYPE html>
<html>
<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Dropbox - 4xx</title>
<link href="https://cfl.dropboxstatic.com/static/css/error.css" rel="stylesheet" type="text/css"/>
<link rel="shortcut icon" href="https://cfl.dropboxstatic.com/static/images/favicon.ico"/>

config here:

[dropbox_gabe]
type = dropbox
token = {"access_token":"xxxxx","token_type":"bearer","expiry":"0001-01-01T00:00:00Z"}
client_id = xxxx
client_secret = xxxx

This seems related: Error 4xx - dropbox

Final edit: I ran this same command two more times (so 4x in total), and each time it generated 10 errors in total, for different folders.