Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.appcompat.widget.Toolbar.setNavigationOnClickListener(android.view.View$OnClickListener)' on a null object reference

[hardilundavia]

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.appcompat.widget.Toolbar.setNavigationOnClickListener(android.view.View$OnClickListener)' on a null object reference at com.gowtham.library.ui.ActVideoTrimmer.onCreate(ActVideoTrimmer.java:149) at android.app.Activity.performCreate(Activity.java:7893) at android.app.Activity.performCreate(Activity.java:7880) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3283) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3457)  at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)  at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)  at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2044)  at android.os.Handler.dispatchMessage(Handler.java:107)  at android.os.Looper.loop(Looper.java:224)  at android.app.ActivityThread.main(ActivityThread.java:7562)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950) 

I am getting crash always when I write below line

TrimVideo.activity(videoUrl) .setHideSeekBar(true) .start(this,startForResult);