Fix mypy errors from error_handlers.py

Author: aneeshgarg

src/a2a/client/client_task_manager.py

@@ -91,7 +91,7 @@ async def save_task_event(
             await self._save_task(event)
             return event
         task_id_from_event = (
-            event.id if isinstance(event, Task) else event.taskId
+            event.id if isinstance(event, Task) else event.task_id
         )
         if not self._task_id:
             self._task_id = task_id_from_event
@@ -114,7 +114,7 @@ async def save_task_event(
         if isinstance(event, TaskStatusUpdateEvent):
             logger.debug(
                 'Updating task %s status to: %s',
-                event.taskId,
+                event.task_id,
                 event.status.state,
             )
             if event.status.message:

src/a2a/utils/error_handlers.py

@@ -65,11 +65,11 @@ async def wrapper(*args: Any, **kwargs: Any) -> Response:
             logger.log(
                 log_level,
                 'Request error: '
-                f"Code={error.root.code}, Message='{error.root.message}'"
-                f'{", Data=" + str(error.root.data) if error.root.data else ""}',
+                f"Code={error.code}, Message='{error.message}'"
+                f'{", Data=" + str(error.data) if error.data else ""}',
             )
             return JSONResponse(
-                content={'message': error.root.message}, status_code=http_code
+                content={'message': error.message}, status_code=http_code
             )
         except Exception as e:
             logger.log(logging.ERROR, f'Unknown error occurred {e}')
@@ -102,8 +102,8 @@ async def wrapper(*args: Any, **kwargs: Any) -> Any:
             logger.log(
                 log_level,
                 'Request error: '
-                f"Code={error.root.code}, Message='{error.root.message}'"
-                f'{", Data=" + str(error.root.data) if error.root.data else ""}',
+                f"Code={error.code}, Message='{error.message}'"
+                f'{", Data=" + str(error.data) if error.data else ""}',
             )
             # Since the stream has started, we can't return a JSONResponse.
             # Instead, we runt the error handling logic (provides logging)