"Content Unavailable" Error on Dashboard

Some of our team members are getting a "Content Unavailable" error when viewing a Dashboard we have created. Can anyone help me resolve it?

Here are some details:

-Users who are getting this error are shared as "Viewers" to the Dashboard only

-The widgets with the error are Report widgets.

-The affected users have not been shared to the originating reports

-Under "Advanced Options", the "Widget editor" option is selected on each of the report widgets so that "...every dashboard viewer sees the same data set as the widget editor, regardless of sheet permissions."

I'm at a loss for what's wrong. Any helpful tips would be appreciated!

Thank you!