Facebook Feed Dialog showing error

I have integrated facebook sdk with my native android app. Currently i am trying to open facebook feed dialog from base adapter class and it is showing me error. I have taken reference from the below link.

https://developers.facebook.com/docs/android/feed-dialog https://developers.facebook.com/docs/reference/dialogs/feed/

Everytime it shows me different errors .

I don't know what's wrong with my code. I am also putting my code here.

 private void publishFeedDialog() {
        Bundle params = new Bundle();
        params.putString("name", "Facebook SDK for Android");
        params.putString("caption", "Build great social apps and get more installs.");
        params.putString("description", "The Facebook SDK for Android makes it easier and faster to develop Facebook integrated Android apps.");
        params.putString("link", "https://developers.facebook.com/android");
        params.putString("picture", "https://raw.github.com/fbsamples/ios-3.x-howtos/master/Images/iossdk_logo.png");

        WebDialog feedDialog = (
                new WebDialog.FeedDialogBuilder(CONTEXT,
                        Session.getActiveSession(),
                        params))
                .setOnCompleteListener(new WebDialog.OnCompleteListener() {

                    @Override
                    public void onComplete(Bundle values,
                                           FacebookException error) {
                        if (error == null) {
                            // When the story is posted, echo the success
                            // and the post Id.
                            final String postId = values.getString("post_id");
                            if (postId != null) {
                                Toast.makeText(CONTEXT,
                                        "Posted story, id: " + postId,
                                        Toast.LENGTH_SHORT).show();
                            } else {
                                // User clicked the Cancel button
                                Toast.makeText(CONTEXT,
                                        "Publish cancelled",
                                        Toast.LENGTH_SHORT).show();
                            }
                        } else if (error instanceof FacebookOperationCanceledException) {
                            // User clicked the "x" button
                            Toast.makeText(getActivity().getApplicationContext(),
                                    "Publish cancelled",
                                    Toast.LENGTH_SHORT).show();
                        } else {
                            // Generic, ex: network error
                            Toast.makeText(CONTEXT,
                                    "Error posting story",
                                    Toast.LENGTH_SHORT).show();
                        }
                    }
                })
                .build();
        feedDialog.show();
    }