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);