java - SQLiteAssetHelper extension returns null -

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I am getting a NullPointerException from my database handler.

Here is my database suspender: 

  Public class database bundler SQLiteAssetHelper extended {personal constant end-end DATABASE_VERSION = 1; Private static last string DATABASE_NAME = "cargrid", TABLE_CARS = "car", KEY_ID = "id", KEY_POSTCODE = "postcode", KEY_ADDRESS = "address", KEY_IMAGE = "image"; Public databashendler (reference reference) {// super (references, database ANN, blank, databasebasessns); Super (context, DATABASE_NAME, context.getExternalFilesDir (empty) .getAbsolutePath (), blank, DATABASE_VERSION);   
 MyActivity.java:  
 The error that is reporting which line:  
  // start the database databaseHandler db = new Databasandler (this); // "this" refers to the reference   
 I'm feeling that this is creating context, but I'm not sure what the context should be. I have just changed the error from the previous line from the SQLiteOpenHelper  
:  
  Public DataSandler (Reference Reference) {// Super (Reference, DATABASE_NAME, blank, Database_Version) ; Super (context, DATABASE_NAME, context.getExternalFilesDir (empty) .getAbsolutePath (), blank, DATABASE_VERSION); }    
 
 
 Your  activity    Databandler DB = new database (getApplicationContext ());   
 or  
  database bundle DB = new databases (your activation.);

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