php - set two parameters in a query builder symfony -

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i want set 2 parameters $type , $superior in query builder 

$qb->select('a')      ->from('xxxbundle:entity', 'a')      ->where('a.typepro = :type')      ->andwhere('a.superior=: superior')      ->setparameter('type', $type)      ->setparameter ('superior',$superior);

but failed appropriate result , following exception :

invalid parameter format, : given, : or ? expected.

any ideas?

there space between ':' , parameter name:

->andwhere('a.superior=: superior')

instead, should be:

->andwhere('a.superior = :superior')

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