1. Songs come from network resources instead of local resources, and there is no network or the network is in poor condition;

2. The song file does not exist or the file storage address has been changed.

My personal suggestion is that you can download music to a specific folder through the searched resources in the future, and then add files to the player. Don't arbitrarily change the storage path of music files. If you want to change the file directory in the future, please clear the music in the player before adding it.