java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference

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Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference	at com.smartfon_apps.timetable_sch32.Db$DbHelper.onCreate(Db.java:68)	at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:251)	at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:187)	at com.smartfon_apps.timetable_sch32.Db.getAllItems(Db.java:38)	at com.smartfon_apps.timetable_sch32.MondayFragment.onCreateView(MondayFragment.java:33)	at android.support.v4.app.Fragment.performCreateView(Fragment.java:2074)	at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)	at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1286)	at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:758)	at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1632)	at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:637)	at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143)	at android.support.v4.view.ViewPager.populate(ViewPager.java:1237)	at android.support.v4.view.ViewPager.populate(ViewPager.java:1085)	at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1611)	at android.view.View.measure(View.java:17496)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466)	at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:671)	at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90)	at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1319)	at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:736)	at android.view.View.measure(View.java:17496)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)	at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)	at android.view.View.measure(View.java:17496)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466)	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1438)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:724)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:615)	at android.view.View.measure(View.java:17496)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)	at android.view.View.measure(View.java:17496)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466)	at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1438)	at android.widget.LinearLayout.measureVertical(LinearLayout.java:724)	at android.widget.LinearLayout.onMeasure(LinearLayout.java:615)	at android.view.View.measure(View.java:17496)	at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5466)	at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)	at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2636)	at android.view.View.measure(View.java:17496)	at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2031)	at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1193)	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1400)	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1078)	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5875)	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)