Property count does not exist about sonataclassificationbundle HOT 3 CLOSED

<?xml version="1.0" encoding="utf-8"?>
<doctrine-mongo-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mongo-mapping"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mongo-mapping
                    http://doctrine-project.org/schemas/orm/doctrine-mongo-mapping.xsd">

    <mapped-superclass name="Sonata\ClassificationBundle\Document\BaseCategory">

        <field name="name"          type="string"       fieldName="name"    />
        <field name="enabled"       type="boolean"      fieldName="enabled" />
        <field name="slug"          type="string"       fieldName="slug"    />

        <field name="description"   type="string"   fieldName="description"    />
        <field name="count"         type="int"      fieldName="count"          />

        <field name="createdAt"    type="timestamp"   fieldName="createdAt" />
        <field name="updatedAt"    type="timestamp"   fieldName="updatedAt" />

        <lifecycle-callbacks>
            <lifecycle-callback type="prePersist" method="prePersist"/>
            <lifecycle-callback type="preUpdate" method="preUpdate"/>
        </lifecycle-callbacks>

    </mapped-superclass>
</doctrine-mongo-mapping>

<?xml version="1.0" encoding="utf-8"?>
<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping" xsi="http://www.w3.org/2001/XMLSchema-instance" schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">
    <!--
         This file has been generated by the EasyExtends bundle ( https://sonata-project.org/easy-extends )

         References :
            xsd                  : https://github.com/doctrine/doctrine2/blob/master/doctrine-mapping.xsd
            xml mapping          : http://www.doctrine-project.org/projects/orm/2.0/docs/reference/xml-mapping/en
            association mapping  : http://www.doctrine-project.org/projects/orm/2.0/docs/reference/association-mapping/en
    -->
    <entity
        name="Application\Sonata\ClassificationBundle\Entity\Category"
        table="classification__category"
        repository-class="Doctrine\ORM\EntityRepository">

        <id name="id" type="integer" column="id">
            <generator strategy="AUTO"/>
        </id>

    </entity>