Why is my dashboard panel returning loadjob error "accessing https:///saved/searches/External API Usage/?output_mode=json, statusCode=502, description=Not Found"

I have a dashboard (within an app) that uses the loadjob command that usually works, but now returns: Error in 'SearchOperator:loadjob': error accessing https:///saved/searches/External API Usage/?output_mode=json, statusCode=502, description=Not Found Any ideas what the issue could be? I have the saved search saved in savedsearches.conf and its scheduled and running successfully