Made some changes to the method

src/song.rs

@@ -118,7 +118,7 @@ impl Song {
                         Err(err) => Err(err),
                     }
                 } else {
-                    Ok(())
+                    Err(std::io::Error::other("Cannot delete file that does not exist"))
                 }
             }
             Err(err) => Err(err),