Symptoms

FlexiCapture finds an error in the document but doesn't show the error or the element it is related to.

Cause

The field that is causing the error has "show on verification" disabled

Resolution

Check if "show on verification" is enabled for all the fields and enable it where it is needed.

Linked articles:

How to determine the Field with the corresponding error: "The document has hidden fields, some of which have warnings" 

The document has hidden fields, some of which have rule errors