Android- downloading from S3 AWS

I download file from S3 AWS server and I want to create bitmap but I get and error:

 File file = new File(Environment.getExternalStorageDirectory().toString() + "/" + event.getImagePath());

       // Log.e("CHECK",Environment.getExternalStorageDirectory().toString());

        TransferUtility transferUtility = Util.getTransferUtility(EventAdapter.this.getContext());
        // Initiate the download
        TransferObserver observer = transferUtility.download(AWSConfiguration.BUCKET_NAME, event.getImagePath(), file);

        Bitmap bitmap = BitmapFactory.decodeFile(observer.getAbsoluteFilePath());
//
        imageView.setImageBitmap(bitmap);

ERROR:

E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /storage/emulated/0/49039c3d-a257-4ee4-b967-f1d3be1d516f.png: open failed: ENOENT (No such file or directory)