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java.lang.NullPointerException: 	at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:224)	at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:188)	at com.cele.nd.frasesidiomaticas.BDD.createDataBase(BDD.java:44)	at com.cele.nd.frasesidiomaticas.IdiomalistFragment.onCreateView(IdiomalistFragment.java:44)	at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:829)	at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1035)	at android.app.BackStackRecord.run(BackStackRecord.java:635)	at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1397)	at android.app.FragmentManagerImpl$1.run(FragmentManager.java:426)	at android.os.Handler.handleCallback(Handler.java:615)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:137)	at android.app.ActivityThread.main(ActivityThread.java:4745)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:511)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)	at dalvik.system.NativeStart.main(Native Method)