Android Studio Bottom Navigation caused error - android-studio

Question

I dont know how to solve it i try too much but if i make a bottom navigation my app unfortunately stopped working after splash screen plz help me
When i remove bottom navigation app works perfect but when i add bottom navigation it not works but i need to add bottom navigation How can i resolve this error
my xml code
<com.google.android.material.bottomnavigation.BottomNavigationView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/bottom_nav"
android:layout_alignParentBottom="true"
app:menu="#menu/bottom_menu"
tools:layout_editor_absoluteX="1dp"
android:background="#color/white"
app:itemIconTint="#00695C"
app:itemTextColor="#00695C"
tools:layout_editor_absoluteY="49dp"
/>
My java file code
bottomNavigationView.findViewById(R.id.bottom_nav);
bottomNavigationView.setOnNavigationItemSelectedListener(onNav);
getSupportFragmentManager().beginTransaction().replace(R.id.frame_layout,new HomeFragment()).commit();
`private BottomNavigationView.OnNavigationItemSelectedListener onNav=new BottomNavigationView.OnNavigationItemSelectedListener()` {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
Fragment selected = null;
switch (item.getItemId()){
case R.id.nav_home:
selected = new HomeFragment();
break;
case R.id.nav_chat:
selected = new ChatFragment();
break;
case R.id.nav_discussion:
selected = new DiscussionFragment();
break;
case R.id.nav_notification:
selected = new NotificationFragment();
break;
case R.id.nav_profile:
selected = new ProfileFragment();
break;
}
getSupportFragmentManager().beginTransaction().replace(R.id.frame_layout, selected).commit();
return true;
}
};
MENU
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item android:id="#+id/nav_home"
android:title="#string/home"
app:showAsAction="always"
android:icon="#drawable/ic_home"
/>
<item android:id="#+id/nav_chat"
android:title="#string/chat"
app:showAsAction="always"
android:icon="#drawable/ic_inbox"/>
<item
android:id="#+id/nav_discussion"
android:title="Discussion"
app:showAsAction="always"
android:icon="#drawable/ic_discussion"/>
<item
android:id="#+id/nav_notification"
android:title="#string/notification"
app:showAsAction="always"
android:icon="#drawable/ic_notification"/>
<item
android:id="#+id/nav_profile"
android:title="#string/profile"
app:showAsAction="always"
android:icon="#drawable/ic_profile"/>
</menu>
Error Shown in logcat
07-05 01:24:26.822 5495-5514/com.example.appname E/ActivityThread: Failed to find provider
info for com.google.android.gms.chimera
07-05 01:24:26.823 5495-5514/com.example.appname E/DynamiteModule: Failed to load IDynamiteLoader from GmsCore: Application package com.google.android.gms not found
07-05 01:24:26.830 5495-5514/com.example.appname E/DynamiteModule: Failed to load IDynamiteLoader from GmsCore: Application package com.google.android.gms not found
07-05 01:24:27.591 5495-5515/com.example.appname E/ActivityThread: Failed to find provider info for com.google.android.gms.phenotype
07-05 01:24:32.340 5495-5495/com.example.appname E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.appname, PID: 5495
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.paragonssoft.community/com.paragonssoft.community.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View com.google.android.material.bottomnavigation.BottomNavigationView.findViewById(int)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View com.google.android.material.bottomnavigation.BottomNavigationView.findViewById(int)' on a null object reference
at com.example.appname.MainActivity.onCreate(MainActivity.java:35)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
at android.app.ActivityThread.-wrap11(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5417) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)