package modelimport ("errors""github.com/deluan/rest")var (ErrNotFound = rest.ErrNotFoundErrInvalidAuth = errors.New("invalid authentication")ErrNotAuthorized = rest.ErrPermissionDeniedErrExpired = errors.New("access expired")ErrNotAvailable = errors.New("functionality not available")ErrValidation = errors.New("validation error")ErrPlaylistNotEditable = errors.New("playlist tracks are not editable"))