Stormy app failure

I am currently going through the Android Lists and Adapters Ben Jakuben

I have now added the hourly forecast recycler view and whenever I click the hourly or daily buttons the app crashes and says "unfortunately stormy has stopped". Any ideas on what is going wrong?

06-17 12:54:42.417 22254-22268/com.willisapps.stormy W/dalvikvm﹕ VFY: unable to find class referenced in signature (Ljava/nio/file/Path;) 06-17 12:54:42.417 22254-22268/com.willisapps.stormy W/dalvikvm﹕ VFY: unable to find class referenced in signature ([Ljava/nio/file/OpenOption;) 06-17 12:54:42.417 22254-22268/com.willisapps.stormy I/dalvikvm﹕ Could not find method java.nio.file.Files.newOutputStream, referenced from method okio.Okio.sink 06-17 12:54:42.417 22254-22268/com.willisapps.stormy W/dalvikvm﹕ VFY: unable to resolve static method 15344: Ljava/nio/file/Files;.newOutputStream (Ljava/nio/file/Path;[Ljava/nio/file/OpenOption;)Ljava/io/OutputStream; 06-17 12:54:42.417 22254-22268/com.willisapps.stormy W/dalvikvm﹕ VFY: unable to find class referenced in signature (Ljava/nio/file/Path;) 06-17 12:54:42.417 22254-22268/com.willisapps.stormy W/dalvikvm﹕ VFY: unable to find class referenced in signature ([Ljava/nio/file/OpenOption;) 06-17 12:54:42.427 22254-22268/com.willisapps.stormy I/dalvikvm﹕ Could not find method java.nio.file.Files.newInputStream, referenced from method okio.Okio.source 06-17 12:54:42.427 22254-22268/com.willisapps.stormy W/dalvikvm﹕ VFY: unable to resolve static method 15343: Ljava/nio/file/Files;.newInputStream (Ljava/nio/file/Path;[Ljava/nio/file/OpenOption;)Ljava/io/InputStream; 06-17 12:54:42.707 22254-22268/com.willisapps.stormy I/MainActivity﹕ From JSON: America/Los_Angeles 06-17 12:56:34.116 22254-22347/com.willisapps.stormy I/MainActivity﹕ From JSON: America/Los_Angeles 06-17 12:56:35.448 22254-22354/com.willisapps.stormy I/MainActivity﹕ From JSON: America/Los_Angeles 06-17 12:56:36.999 22254-22355/com.willisapps.stormy I/MainActivity﹕ From JSON: America/Los_Angeles 06-17 12:58:59.611 22254-22254/com.willisapps.stormy W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x416e3da0) 06-17 12:58:59.611 22254-22254/com.willisapps.stormy E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.willisapps.stormy, PID: 22254 java.lang.NullPointerException at com.willisapps.stormy.adapters.DayAdapter.getView(DayAdapter.java:52) at android.widget.AbsListView.obtainView(AbsListView.java:2743) at android.widget.ListView.makeAndAddView(ListView.java:1811) at android.widget.ListView.fillDown(ListView.java:697) at android.widget.ListView.fillFromTop(ListView.java:763) at android.widget.ListView.layoutChildren(ListView.java:1641) at android.widget.AbsListView.onLayout(AbsListView.java:2564) at android.view.View.layout(View.java:15762) at android.view.ViewGroup.layout(ViewGroup.java:4880) at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1055) at android.view.View.layout(View.java:15762) at android.view.ViewGroup.layout(ViewGroup.java:4880) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) at android.widget.FrameLayout.onLayout(FrameLayout.java:388) at android.view.View.layout(View.java:15762) at android.view.ViewGroup.layout(ViewGroup.java:4880) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1677) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1531) at android.widget.LinearLayout.onLayout(LinearLayout.java:1440) at android.view.View.layout(View.java:15762) at android.view.ViewGroup.layout(ViewGroup.java:4880) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) at android.widget.FrameLayout.onLayout(FrameLayout.java:388) at android.view.View.layout(View.java:15762) at android.view.ViewGroup.layout(ViewGroup.java:4880) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2357) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2070) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1255) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6625) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:812) at android.view.Choreographer.doCallbacks(Choreographer.java:612) at android.view.Choreographer.doFrame(Choreographer.java:582) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:798) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:146) at android.app.ActivityThread.main(ActivityThread.java:5602) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) at dalvik.system.NativeStart.main(Native Method)