Symfony: Property does not exist - 500 Internal Server Error - ReflectionException

Question

I removed $hearAboutIndustry from the entity and now getting error below only in production server, not on local and staging server! Any idea why or solution?

Property Tete\AdminBundle\Entity\Customer::$hearAboutIndustry does not exist
500 Internal Server Error - ReflectionException

config_prod.yml

doctrine:
    orm:
        metadata_cache_driver: apc
        result_cache_driver: apc
        query_cache_driver: apc

What I have do to solve it so far:

• Removed getter and setters from the entity.
• Deleted whole cache and logs folders and re-created back, inc 777.
• Just in case run cache:clear --env=prod
• Searched hearAboutIndustry in all directories/files of the project. No reference at all.
• Run doctrine:schema:update. DB is updated.
• Run doctrine:generate:entities. Entity is updated.
• app/console doctrine:cache:clear-metadata
• app/console doctrine:cache:clear-query
• app/console doctrine:cache:clear-result

Answer 1

As Adam suggested above in comment, we better restart apache if all the above solutions have been tried and getting no success. The solution is:

sudo apachectl graceful