Open streets Map Change Icons on Value

Hey. I am working on a project of addresses with markers and Openstreet Maps. He did fine the past few days, but once I get this message. Why and who knows a solution.
Notification:
Cross-Origin Request Blocked: The Same Origin Policy does not allow reading of the external resource at https://nominatim.openstreetmap.org/search/Appelvink%201j?format=json. (Reason: CORS application was unsuccessful).
Please advice?