Facebook notification click not working on android facebook sdk

Question

I have an app in which user can send invitation to other users to join the app. Following is my code and notification is being sent perfectly fine:

private void sendRequestDialog() {
        Bundle params = new Bundle();
        params.putString("message", "Join my carpool from " + carpool.source + " to " + carpool.destination);
    WebDialog requestsDialog = (
        new WebDialog.RequestsDialogBuilder(getActivity(),
            Session.getActiveSession(),
            params))
            .setOnCompleteListener(new OnCompleteListener() {

                @Override
                public void onComplete(Bundle values,
                    FacebookException error) {
                    if (error != null) {
                        if (error instanceof FacebookOperationCanceledException) {
                            Toast.makeText(getActivity().getApplicationContext(), 
                                "Request cancelled", 
                                Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(getActivity().getApplicationContext(), 
                                "Network Error", 
                                Toast.LENGTH_SHORT).show();
                        }
                    } else {
                        final String requestId = values.getString("request");
                        if (requestId != null) {
                            Toast.makeText(getActivity().getApplicationContext(), 
                                "Request sent",  
                                Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(getActivity().getApplicationContext(), 
                                "Request cancelled", 
                                Toast.LENGTH_SHORT).show();
                        }
                    }   
                }

            })
            .build();
    requestsDialog.show();
}

Once the notification is send . The invited user clicks on the notification and is shown a page in Facebook in which it is written "Trouble Loading . Tap to retry" I have configured the app settings page, but I keep getting this error.

Any insight in this issue will be highly appreciated. Thanks