android Oreo Crash error

The App works on previous versions of Android but not on Oreo, its a webview using Firebase Notifications. I am a bit new to this but have been researching this error and haven't found anything that is similar.

--------- beginning of crash

E/AndroidRuntime: FATAL EXCEPTION: main Process: net.oneteamit.tk, PID: 3171 java.lang.RuntimeException: Unable to start activity ComponentInfo{net.oneteamit.tk/net.oneteamit.tk.MainActivity}: java.lang.IllegalArgumentException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892) at android.app.ActivityThread.-wrap11(Unknown Source:0) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593) at android.os.Handler.dispatchMessage(Handler.java:105) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6541) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767) Caused by: java.lang.IllegalArgumentException at android.os.Parcel.readException(Parcel.java:1946) at android.os.Parcel.readException(Parcel.java:1888) at android.app.INotificationManager$Stub$Proxy.createNotificationChannels(INotificationManager.java:1418) at android.app.NotificationManager.createNotificationChannels(NotificationManager.java:446) at android.app.NotificationManager.createNotificationChannel(NotificationManager.java:434) at net.oneteamit.tk.MainActivity.onCreate(MainActivity.java:47) at android.app.Activity.performCreate(Activity.java:6975) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)  at android.app.ActivityThread.-wrap11(Unknown Source:0)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)  at android.os.Handler.dispatchMessage(Handler.java:105)  at android.os.Looper.loop(Looper.java:164)  at android.app.ActivityThread.main(ActivityThread.java:6541)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)  W/cr_media: Requires BLUETOOTH permission Application terminated.

public class MainActivity extends AppCompatActivity {

private WebView mWebView;


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






    //setContentView(R.layout.activity_main);


    mWebView = (WebView) findViewById(R.id.activity_main_webview);
    WebSettings webSettings = mWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    mWebView.loadUrl("My test URL");
    mWebView.setWebViewClient(new WebViewClient()); //I DISABLED THIS TO HAVE IT OPEN in browser
    mWebView.getSettings().setAppCacheEnabled(false);
    mWebView.clearCache(true);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        // Create channel to show notifications.
        String channelId  = getString(R.string.default_notification_channel_id);
        String channelName = getString(R.string.default_notification_channel_name);
        NotificationManager notificationManager =
                getSystemService(NotificationManager.class);
        notificationManager.createNotificationChannel(new NotificationChannel(channelId,
                channelName, NotificationManager.IMPORTANCE_LOW));
    }
    //webSettings.setDomStorageEnabled (true);
    //mWebView.getSettings().setDomStorageEnabled(true);
    //mWebView.getSettings().setDatabaseEnabled(true);
    //mWebView.getSettings().setAppCacheEnabled(true);
    //mWebView.getSettings().setJavaScriptEnabled(true);
    //mWebView.setFocusable(false);
    //mWebView.setFocusableInTouchMode(false);
    //mWebView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
    // mWebView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
    //mWebView.setScrollBarStyle(View.SCROLLBARS_OUTSIDE_OVERLAY);
    //mWebView.setScrollbarFadingEnabled(false);
    //this.mWebView.setVerticalScrollBarEnabled(true);
    //this.mWebView.setHorizontalScrollBarEnabled(true);
    mWebView.getSettings().setUseWideViewPort(true);//setting wide view
    mWebView.getSettings().setLoadWithOverviewMode(true);//setting default zoomed out view
    mWebView.setInitialScale(1);
    mWebView.getSettings().setBuiltInZoomControls(true);//setting zoom controls

}

@Override
public void onBackPressed() {
    if(mWebView.canGoBack()) {
        mWebView.goBack();
    } else {
        super.onBackPressed();
    }
}



@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_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

}

Manifest

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/Theme.AppCompat.Light.NoActionBar">


    <!-- Set custom default icon. This is used when no icon is set for incoming notification messages.

    <meta-data
        android:name="com.google.firebase.messaging.default_notification_icon"
        android:resource="@mipmap/ic_launcher" />
    <!-- the location above will tell the app where to look for your notification Icon -->


    <meta-data
        android:name="com.google.firebase.messaging.default_notification_color"
        android:resource="@color/colorAccent" />

    <meta-data
        android:name="com.google.firebase.messaging.default_notification_channel_id"
        android:value="@string/default_notification_channel_id"/>



    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
        <intent-filter>
            <action android:name="com.androidsrc.launchfrombrowser" />

            <category android:name="android.intent.category.DEFAULT" />
            <category android:name="android.intent.category.BROWSABLE" />
        </intent-filter>

    </activity>





    <service android:name=".FirebaseInstanceIdService">
        <intent-filter>
            <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
        </intent-filter>
    </service>
    <service android:name=".FirebaseMessagingService">
        <intent-filter>
            <action android:name="com.google.firebase.MESSAGING_EVENT" />
        </intent-filter>
    </service>
    <service android:name=".MyJobService"
             android:exported="false">
    <intent-filter>
        <action android:name="com.firebase.jobdispatcher.ACTION_EXECUTE"/>
    </intent-filter>
    </service>
</application>
<uses-permission android:name="android.permission.INTERNET" />