这个错误是由于Google Cloud身份验证过期引起的。解决此问题的方法是重新获取身份验证令牌。以下是一个示例代码来获取新的身份令牌：

from google.oauth2 import service_account
from google.auth.transport.requests import Request
from google.cloud import bigquery

credentials = service_account.Credentials.from_service_account_file("path/to/service_account.json")

# refresh the credentials
if credentials.expired and credentials.refresh_token:
    credentials.refresh(Request())

client = bigquery.Client(credentials=credentials)
# use the client for your BigQuery operations

此代码将检查是否过期，并在需要时刷新凭据。您只需将path/to/service_account.json替换为您的服务帐户文件路径，然后使用Client创建BigQuery客户端实例。