java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.Fragment android.app.FragmentManager.findFragmentById(int)' on a null object reference

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Attempt to invoke virtual method 'android.app.Fragment android.app.FragmentManager.findFragmentById(int)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.Fragment android.app.FragmentManager.findFragmentById(int)' on a null object reference
at com.gpstracker.viktor.gpstracker2.Home_Fragment.(Home_Fragment.java:82)
at com.gpstracker.viktor.gpstracker2.GPSTracker2.selectItemFromDrawer(GPSTracker2.java:105)
at com.gpstracker.viktor.gpstracker2.GPSTracker2.access$000(GPSTracker2.java:28)
at com.gpstracker.viktor.gpstracker2.GPSTracker2$1.onItemClick(GPSTracker2.java:67)
at android.widget.AdapterView.performItemClick(AdapterView.java:310)
at android.widget.AbsListView.performItemClick(AbsListView.java:1145)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3066)
at android.widget.AbsListView$3.run(AbsListView.java:3903)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5461)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)

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