The method save() does not exist on FSi\Bundle\AdminBundle\Admin\Element. It seems like you code against a sub-type of FSi\Bundle\AdminBundle\Admin\Element such as FSi\Bundle\AdminBundle\A...CRUD\GenericCRUDElement or FSi\Bundle\AdminBundle\A...CRUD\GenericFormElement or FSi\Bundle\AdminBundle\A...\GenericResourceElement or FSi\Bundle\AdminBundle\Admin\CRUD\FormElement or FSi\Bundle\AdminBundle\Admin\CRUD\CRUDElement or FSi\Bundle\AdminBundle\Admin\CRUD\CRUDElement or FSi\Bundle\AdminBundle\Admin\CRUD\FormElement or FSi\Bundle\AdminBundle\A...ourceRepository\Element or FSi\Bundle\AdminBundle\Admin\CRUD\CRUDElement or FSi\Bundle\AdminBundle\D...in\DependentFormElement or FSi\Bundle\AdminBundle\A...UD\DependentFormElement or FSi\Bundle\AdminBundle\A...UD\DependentCRUDElement or FSi\Bundle\AdminBundle\D...in\DependentCRUDElement.
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation