If you are attempting to create a search within your Showcase IDX search library, you may find that you receive the above error.
When you receive this error, it is because the search query that you were attempting to do has failed. It's not because the criteria are wrong or you set up your search incorrectly. It's simply a small system failure while trying to collect the listings and is an EASY fix.
All you have to do is refresh your browser page and try to set up the search again.