TYPO3 Core

ERROR    Unknown column 'be_users.user_name' in 'order clause'

solution:

<INCLUDE_TYPOSCRIPT: source="FILE:EXT:beuser/Configuration/TypoScript/setup.txt">
module.tx_beuser {
        persistence {
                classes {
                        TYPO3\CMS\Beuser\Domain\Model\BackendUser {
                                mapping {
                                        tableName = be_users
                                        columns {
                                                username.mapOnProperty = userName
                                        }
                                }
                        }
                }
        }                                                                
}

missing in typo3/sysext/beuser/Configuration/TypoScript/setup.txt