``` class IndexDashboard(Dashboard): def __init__(self, **kwargs): super().__init__(**kwargs) for app in sorted(apps.get_app_configs(), key=lambda app: app.name): # here is error self.children.append( modules.AppList( title=app.verbose_name, column=1, collapsible=True, models=(f"{app.name}.*",), css_classes=("grp-closed",), ), ) ``` As you can see there is no error actually. app in lambda function is local to lambda, not for __init__