java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.lpu/com.example.lpu.MainActivity}: java.lang.NullPointerException

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java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.lpu/com.example.lpu.MainActivity}: java.lang.NullPointerException
at com.example.lpu.MainActivity.onCreate(MainActivity.java:29)
at android.app.Activity.performCreate(Activity.java:4466)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
at android.app.ActivityThread.access$600(ActivityThread.java:123)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)

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