Thank you@weaverryan.

Is there any solution out there?
I've posted my environment over heresymfony/flex#346 (comment)

@jeroendesloovere looks totally unrelated... If you found a bug, please open a separate issue.

Are you sure?
I havesrc/DataFixtures/* classes which inherit from DoctrineFixturesBundle which is only loaded in intest anddev environments.

So when I try to deploy to Heroku (which usesprod environment), these DoctrineFixturesBundle classes can't be autoloaded and so everything throws an error.

//...use Doctrine\Bundle\FixturesBundle\Fixture;use Doctrine\Common\DataFixtures\OrderedFixtureInterface;use Doctrine\Common\Persistence\ObjectManager;class LoadUserData extends Fixture implements OrderedFixtureInterface{    public function load(ObjectManager $manager)    {        // ...    }    public function getOrder()    {        return 10;    }}

Solution

Usingcomposer require doctrine-fixtures-bundle --dev was so wrong.
This has to becomposer require doctrine-fixtures-bundle.

Since in my case, this bundle is used intests.

Wrongcomposer.json

"require":{// ...},"require-dev":{// ..."doctrine/doctrine-fixtures-bundle":"^3.0",},

Correctcomposer.json

"require":{// ..."doctrine/doctrine-fixtures-bundle":"^3.0",},"require-dev":{// ...},

Other things I tried but failed

# services.yamlservices:# ignore datafixtures in production environment,# because it usages DoctrineFixturesBundle classes which are only loaded in for "dev" and "test"  environmentsBabyGuesser\DataFixtures\:resource:'../src/DataFixtures/*'autowire:falseautoconfigure:falsepublic:false

Local everything is perfect, but when pushing to heroku thecache:clear failed every time.

Hello guys,

I had the same error with the DoctrineFixtureBundle, to fix this problem, I added this in my service.yaml

services:    App\:        resource: '../src/*'        exclude: '../src/{DependencyInjection,Entity,Migrations,Tests,DataFixtures,Kernel.php}'

The DateFixtures directory is exclude and I don't have any more this error using prod with this bundle in my composer-dev.

I hope it will help someone.