wxlog:Error:set token fail, errCode:4, errLog:wx token[] or contextId[(null)] is nil! 微信登录的时候产生了错误。 使用SendAuthReq()后报了以上错误: @objc func wxLogin() {            let req = SendAuthReq()            req.openID = "wxxxxxxxxxxxxxxxxc"            req.scope = "snsapi_userinfo"            req.state = "12345"            WXApi.send(req) } 使用checkUniversalLinkReady: WXApi.checkUniversalLinkReady { (step, result) in      print("step:", step)      print("result:", result.success, result.errorInfo, result.suggestion) } 控制台打印: step: WXULCheckStep result: true Universal Link check passed. The application is launched by WeChat via Universal Link  step: WXULCheckStep result: true All Check Passed!  微信登录的错误在手机上表现为： 点击App上的登录后，跳转到微信，出现“正在登录中”的提示，后立即返回App。然后报错：set token fail, errCode:4