如何将响应保存到工作空间，我调用相应的api错误信息也不是很明确

[youbiaokachi123]

Bug description
我想在Action响应的时候，将相应结果保存为一个文件，我调用了这行代码
await self.repo.resources.code_summary.save(filename="prd.md", content=response)，我却得到一个错误
`2025-03-13 20:21:05.436 | ERROR | metagpt.utils.common:wrapper:631 - Exception occurs, start to serialize the project, exp:
Traceback (most recent call last):
File "/Users/huanhu/PycharmProjects/hello_metagpt/.venv/lib/python3.11/site-packages/metagpt/utils/common.py", line 640, in wrapper
return await func(self, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/huanhu/PycharmProjects/hello_metagpt/.venv/lib/python3.11/site-packages/metagpt/roles/role.py", line 550, in run
rsp = await self.react()
^^^^^^^^^^^^^^^^^^
ValueError: Invalid root

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/Users/huanhu/PycharmProjects/hello_metagpt/.venv/lib/python3.11/site-packages/metagpt/utils/common.py", line 626, in wrapper
result = await func(self, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/huanhu/PycharmProjects/hello_metagpt/.venv/lib/python3.11/site-packages/metagpt/team.py", line 134, in run
await self.env.run()
Exception: Traceback (most recent call last):
File "/Users/huanhu/PycharmProjects/hello_metagpt/.venv/lib/python3.11/site-packages/metagpt/utils/common.py", line 640, in wrapper
return await func(self, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/huanhu/PycharmProjects/hello_metagpt/.venv/lib/python3.11/site-packages/metagpt/roles/role.py", line 550, in run
rsp = await self.react()
^^^^^^^^^^^^^^^^^^
File "/Users/huanhu/PycharmProjects/hello_metagpt/.venv/lib/python3.11/site-packages/metagpt/roles/role.py", line 517, in react
rsp = await self._react()
^^^^^^^^^^^^^^^^^^^
File "/Users/huanhu/PycharmProjects/hello_metagpt/.venv/lib/python3.11/site-packages/metagpt/roles/role.py", line 463, in _react
rsp = await self._act()
^^^^^^^^^^^^^^^^^
File "/Users/huanhu/PycharmProjects/hello_metagpt/huhuan_soft_company.py", line 41, in _act
response = await todo.run(msg.content)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/huanhu/PycharmProjects/hello_metagpt/huhuan_soft_company.py", line 24, in run
await self.repo.resources.code_summary.save(filename="prd.md", content=response)
^^^^^^^^^
File "/Users/huanhu/PycharmProjects/hello_metagpt/.venv/lib/python3.11/site-packages/metagpt/actions/action.py", line 42, in repo
self.context.repo = ProjectRepo(self.context.git_repo)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/huanhu/PycharmProjects/hello_metagpt/.venv/lib/python3.11/site-packages/metagpt/utils/project_repo.py", line 97, in init
raise ValueError("Invalid root")
ValueError: Invalid root
`

code
`from metagpt.actions import Action
from metagpt.roles import Role
from metagpt.schema import Message
from metagpt.logs import logger
import asyncio

from metagpt.team import Team

class WritePrd(Action):
PROMPT_TEMPLATE: str = "{instruction}"

name: str = "编写项目需求文档"

async def run(self, instruction: str):
    prompt = self.PROMPT_TEMPLATE.format(instruction=instruction)
    response = await self._aask(prompt)
    await self.repo.resources.code_summary.save(filename="prd.md", content=response)
    return response

class ProductManage(Role):
name: str = "huhuan"

profile: str = "ProductManage"

def __init__(self, **kwargs):
    super().__init__(**kwargs)
    self.set_actions([WritePrd])

async def _act(self) -> Message:
    logger.info(f"{self._setting}: to do {self.rc.todo}({self.rc.todo.name})")
    todo = self.todo
    msg = self.get_memories(k=1)[0]
    response = await todo.run(msg.content)
    msg = Message(content=response, role=self.profile, cause_by=type(todo))

    return msg

async def main():
company = Team()
company.hire([
ProductManage()
])
company.invest(investment=3)

idea = "你好"
company.run_project(idea)
await company.run(n_round=5)

if name == 'main':
asyncio.run(main())
`