java.lang.NullPointerException: uri

There are no downloads. There is no task. I am deleting a file. Also Task and file. I get this error when I try to download it again. APK file

W/System.err(29585): java.lang.NullPointerException: uri
W/System.err(29585): at com.android.internal.util.Preconditions.checkNotNull(Preconditions.java:133)
W/System.err(29585): at android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:1492)
W/System.err(29585): at android.content.ContentResolver.openOutputStream(ContentResolver.java:1242)
W/System.err(29585): at vn.hunghd.flutterdownloader.DownloadWorker.downloadFile(DownloadWorker.java:358)
W/System.err(29585): at vn.hunghd.flutterdownloader.DownloadWorker.doWork(DownloadWorker.java:208)
W/System.err(29585): at androidx.work.Worker$1.run(Worker.java:85)
W/System.err(29585): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
W/System.err(29585): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
W/System.err(29585): at java.lang.Thread.run(Thread.java:919)
I/WM-WorkerWrapper(29585): Worker result FAILURE for Work [ id=96df702b-682a-41a3-9c0e-743712235433, tags={ flutter_download_task, vn.hunghd.flutterdownloader.DownloadWorker } ]