Thank you for your answer. But I didn't download any files at before. Actually, my extension doesn't receive any callbacks in the demo. As mentioned before, the demo reported this error the first time it was run. So now what should I do?

Thank you for your answer. But i didn't download any file. Actually, my extension doesn't receive task callbacks after app install. I got these errors from console.app when I debug the Background Asset from the command line. And what should i do now?

Thank you for your answer. But i didn't download any file. Actually, my extension doesn't receive task callbacks after app install. I got these errors from console.app when I debug the Background Asset from the command line. And what should i do now?