You can validate one or more customized views by selecting them and click the Validate 
button
The page will be updated with the results.
•all issues found will be listed above the list header
•Each view that has issues will show an exclamation mark 
When working from the list page, open the record with an issue.
The page will display the error in more details.
As you cannot fix the error, report it to the user so she can fix it.
Commonly an easy fix is opening the page in question using the view, verify the results, and re-save the view.
