版本0.7.0 保存工作流报错

[lishidetainan]

版本0.7.0 工作流配置如上图，代码运行报错位置，配置文件如上，请问如何配置呢

[lishidetainan]

ValueError: Create DAG rag_chat_awel_flow_template_test error, define_type: json, error: Unable to build operator task: operator_higher_order_knowledge_operator___$$rag$$___v1_0, operator_cls: <class 'dbgpt_app.operators.rag.HOKnowledgeOperator'>, error: 'NoneType' object has no attribute 'config'
报错信息