SQLiteLog﹕ no such table sqlite android

I am new in android development..got this error no such table:form I am trying to add three fields which are JSON , JSON_modified and AdminId

static final String DATABASE_NAME = "db1";
static final int DATABASE_VERSION = 2;
public static final int NAME_COLUMN = 1;

static final String DATABASE_TABLE = "create table "+"adminreg"+
        "( " +"AdminRegID"+" integer primary key autoincrement,"+ "Rest_name text,Contact_person_name text,text,PASSWORD text,Address text); ";
// Variable to hold the database instance

static final String DATABASE_TABLE_REG="CREATE TABLE IF NOT EXISTS "+" form "+
        "("+"Id"+" integer primary key autoincrement, "+" JSON text, AdminId text, JSON_modified text);";

public SQLiteDatabase db;

private final Context context;

private DataBaseHelper dbHelper;
public  LoginDatabaseAdapter(Context _context)
{
    context = _context;
    dbHelper = new DataBaseHelper(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public  LoginDatabaseAdapter open() throws SQLException
{
    db = dbHelper.getWritableDatabase();
    return this;
}
public void close()
{
    db.close();
}

public  SQLiteDatabase getDatabaseInstance()
{
    return db;
}


public void insertEntry(String json,String json_modified)
{
    Log.e("Data Insert reached","yes");

    ContentValues newValues = new ContentValues();
    Log.e("JSON STRING to be insert",json);
    newValues.put("JSON",json);
    newValues.put("JSON_modified",json_modified);
    newValues.put("AdminId","1");
    db.insert("form", null, newValues);
    Toast.makeText(context, "Data Is Successfully Saved", Toast.LENGTH_LONG).show();
    Log.e("context", "Toast");

}

DataBaseHelper.java

public DataBaseHelper(Context context, String  name,SQLiteDatabase.CursorFactory factory, int version)
{
    super(context, name, factory, version);
}
// Called when no database exists in disk and the helper class needs
// to create a new one.
@Override
public void onCreate(SQLiteDatabase _db)
{
    _db.execSQL(LoginDatabaseAdapter.DATABASE_TABLE_REG);
    _db.execSQL(LoginDatabaseAdapter.DATABASE_TABLE);
}
// Called when there is a database version mismatch meaning that the version
// of the database on disk needs to be upgraded to the current version.
@Override
public void onUpgrade(SQLiteDatabase _db, int _oldVersion, int _newVersion)
{
    // Log the version upgrade.
    Log.w("TaskDBAdapter", "Upgrading from version " + _oldVersion + " to " + _newVersion + ", which will destroy all old data");

    // Upgrade the existing database to conform to the new version. Multiple
    // previous versions can be handled by comparing _oldVersion and _newVersion
    // values.
    // The simplest case is to drop the old table and create a new one.
    _db.execSQL("DROP TABLE IF EXISTS " + "TEMPLATE");
    // Create a new one.
    onCreate(_db);
}

This is code of android...please give me answer....thanks in advance