Cross-Origin Request Blocked Openstreetmaps

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.op...1j?format=json. (Reason: CORS application was unsuccessful).

Please advice?