使用文档的示例代码可以回复消息，但 python 控制台报错

描述你遇到的问题:

使用文档的示例代码可以回复消息，但 graia 控制台报错

复现步骤: 该 BUG 会在进行以下操作后出现:

运行文档示例代码

发生错误的代码

from graia.broadcast import Broadcast
from graia.application import GraiaMiraiApplication, Session
from graia.application.message.chain import MessageChain
import asyncio

from graia.application.message.elements.internal import Plain
from graia.application.friend import Friend

loop = asyncio.get_event_loop()

bcc = Broadcast(loop=loop)
app = GraiaMiraiApplication(
    broadcast=bcc,
    connect_info=Session(
        host="http://localhost:3333",  # 填入 httpapi 服务运行的地址
        authKey="IkITKEYgoQNJDm4",  # 填入 authKey
        account=xxxxxxxx,  # 你的机器人的 qq 号
        websocket=True  # Graia 已经可以根据所配置的消息接收的方式来保证消息接收部分的正常运作.
    )
)

@bcc.receiver("FriendMessage")
async def friend_message_listener(app: GraiaMiraiApplication, friend: Friend):
    await app.sendFriendMessage(friend, MessageChain.create([
        Plain("Hello, World!")
    ]))

app.launch_blocking()

控制台日志输出截图:

mirai-console

2021-04-04 13:20:43 I/main: Auto-login xxxxxxxxx
2021-04-04 13:20:43 I/Bot.xxxxxxxxx: Logging in...
2021-04-04 13:20:44 I/Bot.xxxxxxxxx: No OtherClient online.
2021-04-04 13:20:44 I/Bot.xxxxxxxxx: Login successful
2021-04-04 13:20:44 I/main: mirai-console started successfully.
2021-04-04 13:23:01 V/Bot.xxxxxxxxx: Name(xxxxxxxxx) -> 你好
2021-04-04 13:23:01 V/Bot.xxxxxxxxx: Friend(xxxxxxxxx) <- Hello, World!

graia-application

Traceback (most recent call last):
  File ".venv\lib\site-packages\graia\broadcast\__init__.py", line 201, in Executor
    result = await run_always_await_safely(
  File ".venv\lib\site-packages\graia\broadcast\utilles.py", line 31, in run_always_await_safely
    return callable(*args, **kwargs)
  File ".venv\lib\site-packages\graia\application\__init__.py", line 237, in logger_friend_message
    message_string=event.messageChain.asSerializationString().__repr__(),
  File ".venv\lib\site-packages\graia\application\message\chain.py", line 396, in asSerializationString
    result.append(e.asSerializationString())
AttributeError: 'Element' object has no attribute 'asSerializationString'
[2021-04-04 13:22:27,164][INFO]: [BOT xxxxxxxxx] Friend(xxxxxxxxx) <- 'Hello, World!'

运行环境:

操作系统: Windows 10
mirai-core 版本: 当前最新版
mirai-api-http 版本: 当前最新版
graia-application-mirai 版本: 当前最新版
是否出现在机器人长期运行后: 否

GraiaProject / Application

使用文档的示例代码可以回复消息，但 python 控制台报错 #117