Failed to load ‘%S’. A ServiceWorker passed an Error Response to FetchEvent.respondWith(). This typically means the ServiceWorker performed an invalid fetch() call.
Methwyd llwytho ‘%S’. Pasiodd ServiceWorker Error Response i FetchEvent.respondWith(). Fel arfer mae hyn yn meddwl fod y Service Worker wedi cyflawni galwad fetch() annilys.