App got crashed on calling CRFileSaver.saveFile() method on emulator

[shivanuj13]

On emulator ( SDK 28 ) saving file via CRFileSaver.saveFile() method results in app crashed with following error, However it's working properly in real device with android 12

D/FileSaverImpl(11496): saveFileBeforeSDK29: Saving /data/user/0/com.example.simple_invoice/cache/invoice.pdf
E/AndroidRuntime(11496): FATAL EXCEPTION: main
E/AndroidRuntime(11496): Process: com.example.simple_invoice, PID: 11496
E/AndroidRuntime(11496): java.io.FileNotFoundException: open failed: EACCES (Permission denied)

My code sample is :
final output = await getTemporaryDirectory();
final file = File('${output.path}/invoice.pdf');
await file.writeAsBytes(await pdf.save());
String? res = await CRFileSaver.saveFile(file.path);