signalR There was an error invoking Hub method XXX
参考:https://www.cnblogs.com/yaopengfei/p/9304308.htmlhttps://blog.csdn.net/weichaoya/article/details/880792711、后端代码publicvoidSendSingleMsg(stringreceiveId,stringmsg){Clients.Client(receiveId).receiveMs