FileNotFoundException in onActivityResult

I am trying to browse only two file-types: images or pdf.

Here is the source:

String[] permissions = new String[]{Manifest.permission.READ_EXTERNAL_STORAGE};
            myPermissions =new MyPermissions(TestDialog.this, 0, permissions);
            MyPermissions.EventHandler permHandler = new MyPermissions.EventHandler() {
                @Override
                public void handle() {

                    Intent intent = new Intent();
                    intent.setAction(Intent.ACTION_GET_CONTENT);
                    intent.setType("application/pdf");
                    intent.setType("image/jpeg");
                    startActivityForResult(intent, 0);
                }
            };

            myPermissions.doIfHasPermissions(permHandler);

Here is a my onActivityResult source:

 @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
        String url = data.getData().getPath();
        File myFile = new File(url);
        Log.e("base64 ", getStringFile(myFile));


    }
    super.onActivityResult(requestCode, resultCode, data);
}

public String getStringFile(File f) {
    InputStream inputStream = null;
    String encodedFile = "", lastVal;
    try {
        inputStream = new FileInputStream(f.getAbsolutePath());

        byte[] buffer = new byte[10240];//specify the size to allow
        int bytesRead;
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        Base64OutputStream output64 = new Base64OutputStream(output, Base64.DEFAULT);

        while ((bytesRead = inputStream.read(buffer)) != -1) {
            output64.write(buffer, 0, bytesRead);
        }
        output64.close();
        encodedFile = output.toString();
    } catch (FileNotFoundException e1) {
        e1.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    lastVal = encodedFile;
    return lastVal;
}

I would like to convert the selected file to Base64, but I get a FileNotFoundException. Does anyone have any idea what am I doing wrong?