Installation exception

 Hey guys. I just tried to migrate my old database to a new Magento2 unit with Data Migration Pro. After submitting all relevant data, the following error occurs:
 
CDbException
The table “{{core_website}}” for active record class “Mage1Website” cannot be found in the database.

/home/baueffiz/neu.bau-effizient.de/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]))

Stack Trace

#0

+
  /home/baueffiz/neu.bau-effizient.de/pub/ub-tool/yii-1.1.19/db/ar/CActiveRecord.php(413): CActiveRecordMetaData->__construct(Mage1Website)
 

#1

+
  /home/baueffiz/neu.bau-effizient.de/pub/ub-tool/yii-1.1.19/db/ar/CActiveRecord.php(663): CActiveRecord->getMetaData()
 

#2

–
  /home/baueffiz/neu.bau-effizient.de/pub/ub-tool/yii-1.1.19/db/ar/CActiveRecord.php(1358): CActiveRecord->getTableSchema()

1353 
1354         if(empty($criteria->with))
1355         {
1356             if(!$all)
1357                 $criteria->limit=1;
1358             $command=$this->getCommandBuilder()->createFindCommand($this->getTableSchema(),$criteria);
1359             return $all ? $this->populateRecords($command->queryAll(), true, $criteria->index) : $this->populateRecord($command->queryRow());
1360         }
1361         else
1362         {
1363             $finder=$this->getActiveFinder($criteria->with);

#3

–
  /home/baueffiz/neu.bau-effizient.de/pub/ub-tool/yii-1.1.19/db/ar/CActiveRecord.php(1478): CActiveRecord->query(CDbCriteria, true)

1473      */
1474     public function findAll($condition='',$params=array())
1475     {
1476         Yii::trace(get_class($this).'.findAll()','system.db.ar.CActiveRecord');
1477         $criteria=$this->getCommandBuilder()->createCriteria($condition,$params);
1478         return $this->query($criteria,true);
1479     }
1480 
1481     /**
1482      * Finds a single active record with the specified primary key.
1483      * See {@link find()} for detailed explanation about $condition and $params.

#4

–
  /home/baueffiz/neu.bau-effizient.de/pub/ub-tool/protected/controllers/Step2Controller.php(28): CActiveRecord->findAll(“code <> ‘admin'”)

23         $result = UBMigrate::checkStep($step->sorder);
24         if ($result['allowed']) {
25 
26             //get list front-end websites from magento1 and exclude the admin website
27             $condition = "code <> 'admin'";
28             $websites = Mage1Website::model()->findAll($condition);
29 
30             if (Yii::app()->request->isPostRequest) {
31                 //get selected data ids
32                 $selectedWebsiteIds = Yii::app()->request->getParam('website_ids', array());
33                 $selectedStoreGroupIds = Yii::app()->request->getParam('store_group_ids', array());

#5

+
  /home/baueffiz/neu.bau-effizient.de/pub/ub-tool/yii-1.1.19/web/actions/CInlineAction.php(49): Step2Controller->actionSetting()