E:\xampp\htdocs\letsGuessGame\socketEvents.js:14
          socket.on("new user", function(data, callback){
          ^

ReferenceError: socket is not defined
    at module.exports (E:\xampp\htdocs\letsGuessGame\socketEvents.js:14:4)
    at Namespace.<anonymous> (E:\xampp\htdocs\letsGuessGame\app.js:135:28)
    at emitOne (events.js:96:13)
    at Namespace.emit (events.js:188:7)
    at Namespace.emit (E:\xampp\htdocs\letsGuessGame\node_modules\socket.io\lib\namespace.js:206:10)
    at E:\xampp\htdocs\letsGuessGame\node_modules\socket.io\lib\namespace.js:174:14
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:98:9)
 [nodemon] app crashed - waiting for file changes before starting...