class message in not building on parse

public class RecipientsActivity extends ActionBarActivity {

    protected  static final String TAG = RecipientsActivity.class.getSimpleName();
    protected static MenuItem mSendMenuItem;
    protected static Uri mMediaUri;
    protected static String mFileType;

    RecipientFragment list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recipients);
        mMediaUri = getIntent().getData();
        mFileType = getIntent().getExtras().getString(ParseConstants.KEY_FILE_TYPE);

    }
    @Override
    protected void onResume() {
        super.onResume();
        FragmentManager fm = getSupportFragmentManager();
        list = new RecipientFragment();
        fm.beginTransaction().add(android.R.id.content, list).commit();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_recipients, menu);
        mSendMenuItem = menu.getItem(0);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_send) {
            ParseObject message = list.createMessage();
            if(message==null){
                //error
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setMessage(getString(R.string.error_selecting_file_error))
                        .setTitle(getString(R.string.error_selecting_file_title))
                        .setPositiveButton(android.R.string.ok, null);
                AlertDialog dialog = builder.create();
                dialog.show();
            }
            else {
                Log.i(TAG, "Sending message and Finist");
                list.send(message);
                finish();
            }
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

public class RecipientFragment extends ListFragment {
    public static final String TAG = RecipientsActivity.class.getSimpleName();

    protected List<ParseUser> mFriends;
    protected ParseRelation<ParseUser> mFriendsRelation;
    protected ParseUser mCurrentUser;

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return super.onCreateView(inflater, container, savedInstanceState);
    }

    @Override
    public void onResume() {
        super.onResume();
        mCurrentUser = ParseUser.getCurrentUser();
        mFriendsRelation = mCurrentUser.getRelation(ParseConstants.KEY_FRIEND_RELATION);

        ParseQuery<ParseUser> query = mFriendsRelation.getQuery();
        query.addAscendingOrder(ParseConstants.KEY_USERNAME);
        query.findInBackground(new FindCallback<ParseUser>() {
            @Override
            public void done(List<ParseUser> friends, ParseException e) {

                if (e == null) {
                    mFriends = friends;

                    String[] userNames = new String[mFriends.size()];
                    int i = 0;
                    for (ParseUser user : mFriends) {
                        userNames[i] = user.getUsername();
                        i++;
                    }
                    ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                            getListView().getContext(),
                            android.R.layout.simple_list_item_checked,
                            userNames);
                    setListAdapter(adapter);
                    getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
                } else {
                    Log.e(TAG, e.getMessage());
                    AlertDialog.Builder builder = new AlertDialog.Builder(getListView().getContext());
                    builder.setMessage(e.getMessage())
                            .setTitle(getString(R.string.query_error_title))
                            .setPositiveButton(android.R.string.ok, null);

                    AlertDialog dialog = builder.create();
                    dialog.show();
                }

            }
        });
    }

    protected void send(ParseObject message) {
        message.saveInBackground(new SaveCallback() {
            @Override
            public void done(ParseException e) {
                if(e==null){
                    //sucess
                    Toast.makeText(getListView().getContext(), getString(R.string.success_message), Toast.LENGTH_LONG).show();
                }
                else{
                    AlertDialog.Builder builder = new AlertDialog.Builder(getListView().getContext());
                    builder.setMessage(getString(R.string.error_sending_message))
                            .setTitle(getString(R.string.error_selecting_file_title))
                            .setPositiveButton(android.R.string.ok, null);
                    AlertDialog dialog = builder.create();
                    dialog.show();
                }
            }
        });
    }

    protected ParseObject createMessage() {
        ParseObject message = new ParseObject(ParseConstants.CLASS_MESSAGES);
        message.put((ParseConstants.KEY_SENDER_IDs), ParseUser.getCurrentUser().getObjectId());
        message.put(ParseConstants.KEY_SENDER_NAME, ParseUser.getCurrentUser().getUsername());
        message.put((ParseConstants.KEY_RECIPIENT_IDs), getRecipientIds());
        message.put(ParseConstants.KEY_FILE_TYPE,RecipientsActivity.mFileType);

        Log.i(TAG, "Creating Message");

        byte[] fileBytes = FileHelper.getByteArrayFromFile(getListView().getContext(), RecipientsActivity.mMediaUri);
        if(fileBytes==null){
            return null;
        }
        else{
            if(RecipientsActivity.mFileType.equals(ParseConstants.TYPE_IMAGE)){
                fileBytes = FileHelper.reduceImageForUpload(fileBytes);
            }
            String fileName = FileHelper.getFileName(getListView().getContext(), RecipientsActivity.mMediaUri,
                    RecipientsActivity.mFileType);
            ParseFile file = new ParseFile(fileName, fileBytes);
            message.put(ParseConstants.KEY_FILE,file);
            return message;
        }

    }

    protected ArrayList<String> getRecipientIds() {
        ArrayList<String> recipientIds = new ArrayList<String>();
        for (int i = 0; i < getListView().getCount(); i++) {
            if (getListView().isItemChecked(i)) {
                recipientIds.add(mFriends.get(i).getObjectId());
            }
        }
        Log.i(TAG,"getting ReceipientID");

        return recipientIds;
    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);

        if (l.getCheckedItemCount() > 0) {
            RecipientsActivity.mSendMenuItem.setVisible(true);
        } else {
            RecipientsActivity.mSendMenuItem.setVisible(false);
        }
    }
}