Trusted Web Activity/ Given CustomTabsIntent should be associated with a valid CustomTabsSession

I have integrated Trusted Web Activity in my android app, when launching TwaLauncherActivity as main Activity, a blank white screen is displaying. I have followed, below GitHub link. https://github.com/GoogleChrome/custom-tabs-client/tree/master/svgomg. Please suggest some solution, thanks in advance,

TwaLauncherActivity.java

    package com.therightdoctors.dpmdoctor;

import android.net.Uri;
import android.os.Bundle;
import android.support.customtabs.CustomTabsIntent;
import android.support.v7.app.AppCompatActivity;

public class TwaLauncherActivity extends AppCompatActivity
        implements TwaSessionHelper.TwaSessionCallback {

    private static final String TWA_ORIGIN = "https://dpm.therightdoctors.com";
    private static final String TARGET_URL = TWA_ORIGIN;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_twa_launcher);

        Uri originUri = Uri.parse(TWA_ORIGIN);
        TwaSessionHelper twaSessionHelper = TwaSessionHelper.getInstance();
        twaSessionHelper.setTwaSessionCallback(this);
        twaSessionHelper.bindService(this, originUri);

     /* TwaSessionHelper.TwaSessionCallback twaSessionCallback = twaSessionHelper.mTwaSessionCallback.get();
        if (twaSessionCallback != null) twaSessionCallback.onTwaSessionReady();*/
        // Set an empty transition from TwaLauncherActivity to the splash screen.
        CustomTabsIntent customTabsIntent = twaSessionHelper.createIntentBuilder()
                .setStartAnimations(this, 0, 0)
                .build();
        Uri openUri = Uri.parse(TARGET_URL);
        twaSessionHelper.openTwa(this, customTabsIntent, openUri);


    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        TwaSessionHelper twaSessionHelper = TwaSessionHelper.getInstance();
        twaSessionHelper.setTwaSessionCallback(null);
    }

    public void openTwa() {
        TwaSessionHelper twaSessionHelper = TwaSessionHelper.getInstance();

        // Set an empty transition from TwaLauncherActivity to the TWA splash screen.
        CustomTabsIntent customTabsIntent = twaSessionHelper.createIntentBuilder()
                .setStartAnimations(this, 0, 0)
                .build();

        Uri openUri = Uri.parse(TARGET_URL);
        twaSessionHelper.openTwa(this, customTabsIntent, openUri);
    }

    @Override
    public void onTwaSessionReady() {
        openTwa();
    }

    @Override
    public void onTwaSessionDestroyed() {
    }

    @Override
    public void onTwaOpened() {
        /*finishAndRemoveTask();*/
    }
}

Debug catalog is showing below exception,

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.therightdoctors.dpmdoctor/com.therightdoctors.dpmdoctor.TwaLauncherActivity}: java.lang.IllegalArgumentException: Given CustomTabsIntent should be associated with a valid CustomTabsSession at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)