在链配置的命名空间中找不到类XXX

In production I've got this error : The class 'Generic\UserBundle\Entity\Session' was not found in the chain configured namespaces

When checking my entities with php app/console doctrine:mapping:info this is what I get

dev:

Found 18 mapped entities:

[OK]   App\AdminBundle\Entity\ArticleOpen
[OK]   App\AdminBundle\Entity\ModuleQuote
[OK]   App\AdminBundle\Entity\Comment
[OK]   App\AdminBundle\Entity\ModuleVideo
[OK]   App\AdminBundle\Entity\ModuleGallery
[OK]   App\AdminBundle\Entity\ArticlesUsers
[OK]   App\AdminBundle\Entity\ModuleText
[OK]   App\AdminBundle\Entity\User
[OK]   App\AdminBundle\Entity\Story
[OK]   App\AdminBundle\Entity\ModuleTitle
[OK]   App\AdminBundle\Entity\ModuleGalleryPicture
[OK]   App\AdminBundle\Entity\ModulePicture
[OK]   App\AdminBundle\Entity\Category
[OK]   App\AdminBundle\Entity\Group
[OK]   App\AdminBundle\Entity\Article
[OK]   Generic\UserBundle\Entity\Session
[OK]   FOS\UserBundle\Model\User
[OK]   FOS\UserBundle\Model\Group

prod

Found 17 mapped entities:
[OK]   App\AdminBundle\Entity\ModulePicture
[OK]   App\AdminBundle\Entity\Group
[OK]   App\AdminBundle\Entity\ArticlesUsers
[OK]   App\AdminBundle\Entity\Story
[OK]   App\AdminBundle\Entity\ModuleTitle
[OK]   App\AdminBundle\Entity\Category
[OK]   App\AdminBundle\Entity\ArticleOpen
[OK]   App\AdminBundle\Entity\ModuleQuote
[OK]   App\AdminBundle\Entity\Article
[OK]   App\AdminBundle\Entity\ModuleGalleryPicture
[OK]   App\AdminBundle\Entity\Comment
[OK]   App\AdminBundle\Entity\ModuleGallery
[OK]   App\AdminBundle\Entity\ModuleVideo
[OK]   App\AdminBundle\Entity\ModuleText
[OK]   App\AdminBundle\Entity\User
[OK]   FOS\UserBundle\Model\User
[OK]   FOS\UserBundle\Model\Group

As you can see the entity Generic\UserBundle\Entity\Session is missing in production. Ive checked the bundle is registered in appKernel and not under the 'dev' section. I've also check the path for typo having case sensitive content in some files/folder but everything seems fine.

Another fact worth mentioning is, I've manually copied this bundle from another project I didn't used the console to generate it so I might have forgot something. The missing entity is the only one on that bundle so it is possible that the whole bundle is wrong not just this entity (but at the same time how can it work in dev mode ?)

Thank you