How to resolve a "Retrieving schema error" in Author Studio

This article explains how to fix the error, "Retrieving schema error". 

1. Click on Entities in the navigation pane.
   
   
   
2. Select an Entity from the list.
3. Click through the fields to find one that has the Default toggle turned ON but the Default Value empty. If you do not find the field that matches this description, repeat step two and choose a different Entity from the list. You will need to go through all the fields in each Entity until you find the one that matches the description.
   
   
   
   
4. Turn the Default toggle OFF. 
   
   
   
5. Navigate back to Test in the left pane and see that your issue has been resolved.