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2018-12-03 01:07:59.011 9819-9819/com.android.tonyvu.sc.demo E/AndroidRuntime: FATAL EXCEPTION: main

Process: com.android.tonyvu.sc.demo, PID: 9819

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.tonyvu.sc.demo/com.android.tonyvu.sc.demo.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.ViewGroup.addView(android.view.View)' on a null object reference

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.NullPointerException: Attempt to invoke virtual method 'void android.view.ViewGroup.addView(android.view.View)' on a null object reference

at com.android.tonyvu.sc.demo.MainActivity.addSideView(MainActivity.java:145)

at com.android.tonyvu.sc.demo.MainActivity.onCreate(MainActivity.java:77)

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)