我和Everyauth一起使用快递 当我使用facebook进行身份验证时，我得到了例外：
Missing code in querystring. The url looks like /auth/facebook/callback?error_code=2102&error_message=User+is+not+a+test+user+owned+by+the+application
Error: Step getCode of `facebook` is promising: code ; however, the step returns nothing. Fix the step by returning the expected values OR by returning a Promise that promises said values.
有什么问题？