error_dump_isFragmentActivity.kt

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: org.kiwix.kiwixcustomcustomexample, PID: 1286
    java.lang.RuntimeException: Unable to start activity ComponentInfo{org.kiwix.kiwixcustomcustomexample/org.kiwix.kiwixmobile.custom.main.CustomMainActivity}: java.lang.IllegalStateException: Required view 'activity_main_root' with ID 2131296334 for field 'root' was not found. If this view is optional add '@Nullable' (fields) or '@Optional' (methods) annotation.
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2913)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: java.lang.IllegalStateException: Required view 'activity_main_root' with ID 2131296334 for field 'root' was not found. If this view is optional add '@Nullable' (fields) or '@Optional' (methods) annotation.
        at butterknife.internal.Utils.findRequiredView(Utils.java:84)
        at butterknife.internal.Utils.findRequiredViewAsType(Utils.java:96)
        at org.kiwix.kiwixmobile.core.main.CoreMainActivity_ViewBinding.<init>(CoreMainActivity_ViewBinding.java:63)
        at java.lang.reflect.Constructor.newInstance0(Native Method)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
        at butterknife.ButterKnife.bind(ButterKnife.java:170)
        at butterknife.ButterKnife.bind(ButterKnife.java:99)
        at org.kiwix.kiwixmobile.core.base.BaseActivity.setContentView(BaseActivity.kt:57)
        at org.kiwix.kiwixmobile.core.main.CoreMainActivity.onCreate(CoreMainActivity.java:32)
        at org.kiwix.kiwixmobile.custom.main.CustomMainActivity.onCreate(CustomMainActivity.kt:68)
        at android.app.Activity.performCreate(Activity.java:7136)
        at android.app.Activity.performCreate(Activity.java:7127)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)