NullPointerException When The button daily_Button clicked it's get error in my log

java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference at com.cyanlabsid.navigation.stormy.weather.Forecast.getIconId(Forecast.java:41) at com.cyanlabsid.navigation.stormy.weather.Day.getIconId(Day.java:64) at com.cyanlabsid.navigation.stormy.adapter.DailyAdapter.getView(DailyAdapter.java:60) at android.widget.AbsListView.obtainView(AbsListView.java:2347) at android.widget.ListView.makeAndAddView(ListView.java:1864) at android.widget.ListView.fillDown(ListView.java:698) at android.widget.ListView.fillFromTop(ListView.java:759) at android.widget.ListView.layoutChildren(ListView.java:1673) at android.widget.AbsListView.onLayout(AbsListView.java:2151) at android.view.View.layout(View.java:15761) at android.view.ViewGroup.layout(ViewGroup.java:5039) at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1077) at android.view.View.layout(View.java:15761) at android.view.ViewGroup.layout(ViewGroup.java:5039) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579) at android.widget.FrameLayout.onLayout(FrameLayout.java:514) at android.view.View.layout(View.java:15761) at android.view.ViewGroup.layout(ViewGroup.java:5039) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557) at android.widget.LinearLayout.onLayout(LinearLayout.java:1466) at android.view.View.layout(View.java:15761) at android.view.ViewGroup.layout(ViewGroup.java:5039) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579) at android.widget.FrameLayout.onLayout(FrameLayout.java:514) at android.view.View.layout(View.java:15761) at android.view.ViewGroup.layout(ViewGroup.java:5039) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2090) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1847) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1065) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5901) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767) at android.view.Choreographer.doCallbacks(Choreographer.java:580) at android.view.Choreographer.doFrame(Choreographer.java:550) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:211) at android.app.ActivityThread.main(ActivityThread.java:5389) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)