API return codes

UNKNOWN_USER : Unknown user - Error
UNKNOWN_TOKEN : Unknown private token - Error
NOT_ALLOWED : Not allowed to access this route or entity - Error
DOES_NOT_EXIST : Entity does not exist - Error
ALREADY_EXISTS : Entity already exists - Error
INVALID_DATA : Missing or invalid data - Error
ASSOCIATED_TO_GENERATION : Channel is related to publications - Error
CONTAINS_PRODUCTS : Family is related to products - Error
ATTRIBUTE_CONFIGURATION : The attribute value does not respect its configuration - Error
ATTRIBUTE_ID_ALREADY_EXISTS : An identifier attribute type already exists - Error
PRODUCTS_EXIST : There are existing products, this identifier cannot be deleted - Error
HAS_ATTRIBUTES : Attributes group is related to attributes - Error
ASSOCIATED_TO_PRODUCTS : Status is related to products - Error
ASSOCIATED_TO_FILES : Status is related to files - Error
ASSOCIATED_TO_USERS : Role is related to users - Error
INCORRECT_EXTENSION : Incorrect file export extension - Error
ALREADY_EXPORTING : Export is already started - Error
HAS_EXPORTS : This template is associated to exports, it can't be deleted - Error
WRONG_CSV_SEPARATOR : The CSV separator is not valid - Error
WRONG_FILE_TYPE : Import file is not a correct type - Error
ALREADY_IMPORTING : Import is already started - Error
NO_DATA : No data provided for product - Error
NO_STATUS : No or not existing status provided - Error
MUST_BE_CATEGORIZED : Product must be categorized - Error
ALREADY_IN_PROCESS : A workflow is already awaiting validation for this entity and this update type - Error
TEMPLATE_DOES_NOT_FIT : The product template does not fit in the publication format - Error
ERROR_LIMIT_REACHED : error.ERROR_LIMIT_REACHED - Error
PRODUCTS_EXIST : There are existing products, this identifier cannot be deleted - Error
RESERVED_CODE : This code is reserved for a system attribute - Error
WRONG_TYPE : The provided attribute type is not correct - Error
IS_DISABLED : The connector is disabled - Error
ALREADY_SYNCHRONIZING : Connector is already synchronizing - Error
ASSOCIATION_NOT_DIFFERENT_BY_CHANNEL : error.ASSOCIATION_NOT_DIFFERENT_BY_CHANNEL - Error
NO_FAMILY : No family given to product - Warning
WORKFLOW_CREATED : A workflow is now created and awaiting validation for this entity - Information