Invalid data source object

Summary:

I have a user who frequently gets a Smart View error when inputting data. It does not stop her from doing her work, but I haven't seen it before, and would like to know how to resolve it.

Content (required):

The error is a pop up with the x in the red circle and says "Invalid data source object".

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):