Issues using Harper in Ellipsus

**Describe the bug**
Harper does not seem to be working within the Ellipsus web app or website. I have tried both.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'write.ellipsus.com'
2. Click the power button in the Chrome extension to enable Harper.
3. Click into text editor.
4. See error

**Expected behavior**
I expected that Harper would start pointing out grammatical errors just as it does on other websites.

**Platform**
Issue is occurring in Chrome.

Reproduce the problem in Chrome by opening write.ellipsus.com, enabling Harper with the extension power button, and entering text in the editor. Compare the behavior with sites where Harper works and capture the error or missing integration detail. Done means grammatical errors are highlighted in the Ellipsus editor as expected.

Written by the indexing model from the issue text.