This error means that Auto-Redaction is not available for your document.
When this error occurs, remove the document from your filing, then perform a Print-To-PDF operation on the document. If you need to redact your document, you may have to redact it manually, then re-scan it into your computer prior to re-uploading it.
Once you have either manually redacted your document or used Print-To-PDF on your document, re-upload your document, but do not use Auto-Redaction on the document this time.
You should then be able to progress with your filing.