java.lang.NullPointerException

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    • java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setAlpha(float)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2326) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) at android.app.ActivityThread.access$800(ActivityThread.java:147) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1281) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5264) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:900) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:695) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setAlpha(float)' on a null object reference at com.firebase.ui.auth.ui.email.ImageFocusTransparencyChanger.<init>(ImageFocusTransparencyChanger.java:32) at com.firebase.ui.auth.ui.email.SignInActivity.onCreate(SignInActivity.java:74) at android.app.Activity.performCreate(Activity.java:5975) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)
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