changes in task_user, replaced user_id to card_id

common/models/TaskUser.php

@@ -3,6 +3,7 @@
 namespace common\models;
 
 use Yii;
+use yii\base\InvalidConfigException;
 use yii\db\ActiveQuery;
 
 /**
@@ -65,6 +66,4 @@ class TaskUser extends \yii\db\ActiveRecord
     {
         return $this->hasOne(Task::className(), ['id' => 'task_id']);
     }
-
-
 }