RuntimeException Unable to start activity ComponentInfo SignInHubActivity

Fatal Exception: java.lang.RuntimeException
Unable to start activity
ComponentInfo{com.example.demo.androidAppdemo/com.google.android.gms.auth.api.signin.
internal.SignInHubActivity}: java.lang.NullPointerException
android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2118)
android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:2145)
android.app.ActivityThread.access$600 (ActivityThread.java:130)
android.app.ActivityThread$H.handleMessage (ActivityThread.java:1211)
android.os.Handler.dispatchMessage (Handler.java:99)
android.os.Looper.loop (Looper.java:137)
android.app.ActivityThread.main (ActivityThread.java:4847)
java.lang.reflect.Method.invokeNative (Method.java)
java.lang.reflect.Method.invoke (Method.java:535)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:786)
com.android.internal.os.ZygoteInit.main (ZygoteInit.java:553)
dalvik.system.NativeStart.main (NativeStart.java)

Caused by java.lang.NullPointerException
com.google.android.gms.auth.api.signin.internal.SignInHubActivity.onCreate (Unknown Source:9)
android.app.Activity.performCreate (Activity.java:5187)
android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1104)
android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2064)
android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:2145)
android.app.ActivityThread.access$600 (ActivityThread.java:130)
android.app.ActivityThread$H.handleMessage (ActivityThread.java:1211)
android.os.Handler.dispatchMessage (Handler.java:99)
android.os.Looper.loop (Looper.java:137)
android.app.ActivityThread.main (ActivityThread.java:4847)
java.lang.reflect.Method.invokeNative (Method.java)
java.lang.reflect.Method.invoke (Method.java:535)
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:786)
com.android.internal.os.ZygoteInit.main (ZygoteInit.java:553)
dalvik.system.NativeStart.main (NativeStart.java)