Knowledge source failed. <Gather Form Data> [2]

I have found this error occurs for several possible reasons, most recently for page break "irregularities" that work fine in Word but not in Acrobat. If Acrobat converts one or more pages and stops converting at the end of a page, displaying the message "Knowledge source failed," check the page break. Ensure that the paragraph mark before the page break is Normal style. I found that a page break or section break with a style other than Normal can cause Acrobat form conversion to fail.