Refer to nelmio/alice documentation to see how to create a Processor
class. Given you declared a processor AppBundle\DataFixtures\Processor\UserProcessor, you have to declare it as a
service with the tag hautelook_alice.alice.processor to register it:
# app/config/services.yml
services:
alice.processor.user:
class: AppBundle\DataFixtures\Processor\UserProcessor
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