422 Unprocessable Entity error while running

[insanity54]

python3 gh-issues-import.py --open -u insanity54 -p xxxxx
Loaded options from default config file in '/home/chris/Documents/github-issues-import/config.ini'
You are about to add to 'futureporn/futureporn-www':
 * 103 new issues
 * 37 new comments
 * 3 new milestones
 * 2 new labels
Are you sure you wish to continue? [Y/n] 
ERROR: There was a problem importing the issues.
422 Unprocessable Entity
DETAILS: Invalid request.

"closed_at", "closed_issues", "created_at", "creator", "html_url", "id", "labels_url", "node_id", "number", "open_issues", "updated_at", "url" are not permitted keys.