java.lang.NullPointerException

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    • java.lang.NullPointerException: Attempt to invoke interface method 'int java.util.List.size()' on a null object reference at music.download.justin.adapters.CardAdapter.getItemCount(CardAdapter.java:64) at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:2357) at android.view.View.measure(View.java:18804) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) at android.widget.LinearLayout.onMeasure(LinearLayout.java:630) at android.view.View.measure(View.java:18804) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954) at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) at android.view.View.measure(View.java:18804) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) at android.widget.LinearLayout.onMeasure(LinearLayout.java:630) at android.view.View.measure(View.java:18804) at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1488) at android.view.View.measure(View.java:18804) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) at android.widget.LinearLayout.onMeasure(LinearLayout.java:630) at android.view.View.measure(View.java:18804) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954) at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) at android.support.v7.internal.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:124) at android.view.View.measure(View.java:18804) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954) at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:444) at android.view.View.measure(View.java:18804) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954) at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) at android.view.View.measure(View.java:18804) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) at android.widget.LinearLayout.onMeasure(LinearLayout.java:630) at android.view.View.measure(View.java:18804) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5954) at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2643) at android.view.View.measure(View.java:18804) at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2112) at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1228) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1464) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1119) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6060) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858) at android.view.Choreographer.doCallbacks(Choreographer.java:670) at android.view.Choreographer.doFrame(Choreographer.java:606) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844) at android.os.Handler.handleCallback(Handler.java:746) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5443) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
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