can anyone please help. I've seen many people with the same problem and looked at all suggestions but still cannot get this to work. I have tried to unistall the application and install again, I have tried to change the version number and start again. I've debugged the code and it does go into the onCreate function, but when I go to make a select query it says the users table does not exist. Any help would greatly be appreciated. Thanks guys

DatabaseHandler Class

public class DatabaseHandler extends SQLiteOpenHelper 
{   
    // Variables
    protected static final int DATABASE_VERSION = 1;            
    protected static final String DATABASE_NAME = "MyUser.db";

    // Constructor
    public DatabaseHandler(Context context) 
    { 
        super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    } 

    // Creating Tables 
    @Override
    public void onCreate(SQLiteDatabase db) 
    {           
        // Create the Users table
        // NOTE: I have the column variables saved above
        String CREATE_USERS_TABLE = "CREATE TABLE IF NOT EXISTS Users("
  + KEY_PRIMARY_ID + " " + INTEGER + " " + PRIMARY_KEY + " " + AUTO_INCREMENT + " " + NOT_NULL + "," + USERS_KEY_EMAIL + " " + NVARCHAR+"(1000)" + " " + UNIQUE + " " + NOT_NULL + "," + USERS_KEY_PIN + " " + NVARCHAR+"(10)" + " " + NOT_NULL + ")"; 
  db.execSQL(CREATE_USERS_TABLE);
    }

    // Upgrading database 
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
    { 
      db.execSQL("DROP TABLE IF EXISTS Users"); 
        onCreate(db); 
    }

UserDataSource class

public class UserDataSource 
{
    private SQLiteDatabase db;  
    private DatabaseHandler dbHandler;

    public UserDataSource(Context context) 
    {
        dbHandler = new DatabaseHandler(context);
    }

    public void OpenWriteable() throws SQLException 
    {
        db = dbHandler.getWritableDatabase();
    }

    public void Close() 
    {
        dbHandler.close();
    }

    // Validate the user login with the username and password provided
    public void ValidateLogin(String username, String pin) throws CustomException
    {   
         Cursor cursor = db.rawQuery(   "select * from Users where " + DatabaseHandler.USERS_KEY_EMAIL + " = '" + username + "'" + " and " + DatabaseHandler.USERS_KEY_PIN + " = '" + pin + "'" , null);

         ........
    }

Then in the activity class, I'm calling

UserDataSource uds = new UserDataSource (this);
uds.OpenWriteable();
uds.ValidateLogin("name", "pin");

Any help would be great, thanks very much Graham

The following is the attached log from the error report

11-23 17:47:46.414: I/SqliteDatabaseCpp(26717): sqlite returned: error code = 1, msg = no such table: Users, db=/data/data/prometric.myitemwriter/databases/MyUser.db
11-23 17:47:57.085: D/AndroidRuntime(26717): Shutting down VM
11-23 17:47:57.085: W/dalvikvm(26717): threadid=1: thread exiting with uncaught exception (group=0x40bec1f8)
11-23 17:47:57.171: D/dalvikvm(26717): GC_CONCURRENT freed 575K, 8% free 8649K/9351K, paused 2ms+6ms
11-23 17:47:57.179: E/AndroidRuntime(26717): FATAL EXCEPTION: main
11-23 17:47:57.179: E/AndroidRuntime(26717): java.lang.IllegalStateException: Could not execute method of the activity
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.view.View$1.onClick(View.java:3091)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.view.View.performClick(View.java:3558)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.view.View$PerformClick.run(View.java:14152)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.os.Handler.handleCallback(Handler.java:605)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.os.Handler.dispatchMessage(Handler.java:92)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.os.Looper.loop(Looper.java:137)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.app.ActivityThread.main(ActivityThread.java:4514)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at java.lang.reflect.Method.invokeNative(Native Method)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at java.lang.reflect.Method.invoke(Method.java:511)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at dalvik.system.NativeStart.main(Native Method)
11-23 17:47:57.179: E/AndroidRuntime(26717): Caused by: java.lang.reflect.InvocationTargetException
11-23 17:47:57.179: E/AndroidRuntime(26717):    at java.lang.reflect.Method.invokeNative(Native Method)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at java.lang.reflect.Method.invoke(Method.java:511)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.view.View$1.onClick(View.java:3086)
11-23 17:47:57.179: E/AndroidRuntime(26717):    ... 11 more
11-23 17:47:57.179: E/AndroidRuntime(26717): Caused by: android.database.sqlite.SQLiteException: no such table: Users: , while compiling: select * from Users where email = '' and pin = ''
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:68)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:143)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:361)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:127)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:94)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:53)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1685)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1659)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at projectname.database.UserDataSource.ValidateLogin(UserDataSource.java:73)
11-23 17:47:57.179: E/AndroidRuntime(26717):    at projectname.LoginActivity.btn_login_Click(LoginActivity.java:47)
11-23 17:47:57.179: E/AndroidRuntime(26717):    ... 14 more