Unable to get property 'signalR' of undefined or null reference
javascript, signalr
Solution
You have to reference the appropriate version of JQuery that you have in your Scripts folder.
Problem
I am trying the SignalR intro sample from here: http://www.asp.net/signalr/overview/signalr-20/getting-started-with-signalr-20/tutorial-getting-started-with-signalr-20 Following the sample, I got the error below after pressing F5: Unhandled exception at line 17, column 5 in http://myServer.com:12269/signalr/hubs 0x800a138f - JavaScript runtime error: Unable to get property 'signalR' of undefined or null reference I am new to SignalR, not quite sure where to start. Any insight? A screenshot of the error. It's part of the generated hubs script. The source code on the index.html: ``` <!DOCTYPE html> <html> <head> <title>SignalR Simple Chat</title> <style type="text/css"> .container { background-color: #99CCFF; border: thick solid #808080; padding: 20px; margin: 20px; } </style> </head> <body> <div class="container"> <input type="text" id="message" /> <input type="button" id="sendmessage" value="Send" /> <input type="hidden" id="displayname" /> <ul id="discussion"></ul> </div> <!--Script references. --> <!--Reference the jQuery library. --> <script src="Scripts/jquery-1.6.4.min.js"></script> <!--Reference the SignalR library. --> <script src="Scripts/jquery.signalR-2.1.0.min.js"></script> <!--Reference the autogenerated SignalR hub script. --> <script src="signalr/hubs"></script> <!--Add script to update the page and send messages.--> <script type="text/javascript"> $(function () { // Declare a proxy to reference the hub. var chat = $.connection.chatHub; // Create a function that the hub can call to broadcast messages. chat.client.broadcastMessage = function (name, message) { // Html encode display name and message. var encodedName = $('<div />').text(name).html(); var encodedMsg = $('<div />').text(message).html(); // Add the message to the page. $('#discussion').append('<li><strong>' + encodedName + '</strong>: ' + encodedMsg + '</li>'); }; // Get the user name and store it to prepend to messages. $('#displayname').val(prompt('Enter your name:', '')); // Set initial focus to message input box. $('#message').focus(); // Start the connection. $.connection.hub.start().done(function () { $('#sendmessage').click(function () { // Call the Send method on the hub. chat.server.send($('#displayname').val(), $('#message').val()); // Clear text box and reset focus for next comment. $('#message').val('').focus(); }); }); }); </script> </body> </html> ```