Android - SQLite - "java.lang.NullPointerException" exception in getWritableDatabase method

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http://stackoverflow.com – I need some help. I am a total dummy in java and Android and I am trying to build a small application that store some of information in a SQLite table. But I am always receive a "java.lang.NullPointerException" exception in getWritableDatabase method. Can anyone help me? All the code is below. Thank you. Manifest: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.dbtest" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="10" android: (HowTos)