Hello. I've searched posts consisting this error but their solutions didn't work for me. I have this admin-approved InfoPath Form with QRules published in SharePoint and originally, it's running flawlessly. My stakeholder then asked to display some fields into the library. So, I promoted the fields and it was published successfully.
I can add new entries without any issues but when I tried to open an existing form, the error above appeared. Please do note that the form I'm trying to open is the newly created form. I checked the lists that are incorporated with QRules and saw that QRules ran successfully.
I tried removing the promoted fields in the content type via site settings-site columns but the fields stubbornly stayed in the library settings columns and shows that it's still linked to the said content type.
I tried uploading a new content type (same IP form, no promoted fields) and tried to create a new entry via the newly uploaded content type. New item save success. Opening said form again produces the same error.
Not wanting to populate too many content types into a form library, I also tried deleting the existing content types. Again, said error appeared.
Any ideas what else I can do to fix this? I didn't do any modifications aside from the field promotions. I reviewed and checked my "Form Load" rules and didn't see anything amiss. I have this nagging feeling that the error might come from the promoted fields/columns but of course, It's just a hunch :)
-- Update --
I just tried creating a new form library and deployed the original form. Same thing happened.