I am using Symfony 3.4.0, I try to load fixtures with:
php bin/console doctrine:fixtures:load An error occurred while creating the data, what's wrong?

This command looks for all services tagged with doctrine.fixture.orm.
 There is two ways to fix this problem.
First one: any class that implements
ORMFixtureInterfacewill automatically be registered with this tag.
<?php  namespace AppBundle\DataFixtures\ORM;   use Doctrine\Bundle\FixturesBundle\ORMFixtureInterface; use Doctrine\Common\Persistence\ObjectManager;  class LoadFixtures implements ORMFixtureInterface {     public function load(ObjectManager $manager)     {         #your code     } } Second one: You need manually tag
doctrine.fixture.ormtoDataFixturesinsevice.ymlconfiguration.
services:     ...      # makes classes in src/AppBundle/DataFixtures available to be used as services     # and have a tag that allows actions to type-hint services     AppBundle\DataFixtures\:         resource: '../../src/AppBundle/DataFixtures'         tags: ['doctrine.fixture.orm'] I tried @Alexander's solution but it's doesn't work for me.
I had resolved the same problem by adding the tag service to the class, Symfony doc on the services.yml file bundle:
BlogBundle/Resources/config/services.yml
Services: ... # Fixtures services     BlogBundle\DataFixtures\ORM\PostFixture:         tags: [doctrine.fixture.orm] ... My BlogBundle/DataFixtures/ORM/PostFixture.php class : 
... use Doctrine\Common\DataFixtures\FixtureInterface; use Doctrine\Common\Persistence\ObjectManager; ...  class PostFixture implements FixtureInterface { public function load(ObjectManager $manager)     { ... } } Source Inspiration : Synfony doc -> Service container -> The autoconfigure Option
Hope it'll an alternative solution
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