Getting Unknown Property: Backend\models\

Hi all,

I have a model called Account() , it has a function called getPostsAccounts(); it returns all account data left join with a table called post_accounts bellow is a part of the code:

public function getPostAccounts(){

         return \backend\models\Accounts::find()->joinWith('posts')->all();


this is the relation function

 public function getPosts(){

         return $this->hasOne(post_accounts::className(), ['account_id'=>'id']);


what i always get is this error:

Getting unknown property: backend\models\Accounts::

can anyone help me?

please post the stack trace of the error.

please see the three screenshots of the stack trace

in this case am using twitter table instead of posts but it gives me the same result