This can occur if the query, that the Education Edge Directory part is referencing, has been deleted or renamed in The Education Edge.

To fix this issue: 
  1. Edit the Directory part.
  2. Remove all Search Form Fields and Listing Fields (this should break any hidden link to the old query)
  3. Click Change and select the desired query
  4. Add your Search Form Fields and Listing fields.
  5. Make any other desired updates.
  6. Save