No mapping information to process error in Symfony Doctrine-CodePudding

I have read many questions about this problem and I am almost 100% sure, there is an error in the configuration, but I can't find it on the second day. Can somebody please help me?

My configuration:

orm:
    auto_generate_proxy_classes: true
    naming_strategy: 
    doctrine.orm.naming_strategy.underscore_number_aware
    auto_mapping: true
    mappings:
        Post:
            is_bundle: false
            type: attribute
            dir:'%kernel.project_dir%/src/Core/Post/Domain/Entity'
            prefix: 'Core/Post/Domain/Entity'
            alias: Post

My entity:

#[Entity(repositoryClass: PostRepository::class)] class Post { use IdentifierTrait;

public const HEADER = 'header';
public const BOD = 'body';
public const AUTHOR = 'author';

#[Column(Types::STRING, length: 140)]
private string $header;

#[Column(Types::STRING)]
private string $body;

#[Column(Types::STRING)]
private string $author;

}

CodePudding user response：

Problem was using forslashes instead of backslashes in doctrine.yaml in prefix property. Hope it will help somebody.