Get error message in Acrobat XI after saving a PDF with PDFNet

Question:

After saving a PDF, and then opening in Adobe Acrobat XI, I get the following message when I click on a field.

Answer:

This has to do with how the files are created with some proprietary Adobe logic. This is the post to get rid of this issue.
https://acrobatusers.com/tutorials/how-to-enable-reader-users-to-save-form-data