How to Connect Source Database

I need help. I’ave already added the prefixes. After entering databases info on Step 1, I get the following error on the 2nd step:
CDbException
The table “{{core_website}}” for active record class “Mage1Website” cannot be found in the database.
/home/lp3ikpichhu7/public_html/pub/ub-tool/yii-1.1.19/db/ar/CActiveRecord.php(2390)
 

2378 
2379     /**
2380      * Constructor.
2381      * @param CActiveRecord $model the model instance
2382      * @throws CDbException if specified table for active record class cannot be found in the database
2383      */
2384     public function __construct($model)
2385     {
2386         $this->_modelClassName=get_class($model);
2387 
2388         $tableName=$model->tableName();
2389         if(($table=$model->getDbConnection()->getSchema()->getTable($tableName))===null)
2390             throw new CDbException(Yii::t('yii','The table "{table}" for active record class "{class}" cannot be found in the database.',
2391                 array('{class}'=>$this->_modelClassName,'{table}'=>$tableName)));
2392                 
2393         if(($modelPk=$model->primaryKey())!==null || $table->primaryKey===null)
2394         {
2395             $table->primaryKey=$modelPk;
2396             if(is_string($table->primaryKey) && isset($table->columns[$table->primaryKey]))
2397                 $table->columns[$table->primaryKey]->isPrimaryKey=true;
2398             elseif(is_array($table->primaryKey))
2399             {
2400                 foreach($table->primaryKey as $name)
2401                 {
2402                     if(isset($table->columns[$name]))