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NodeJS TypeError: no se puede leer la propiedad 'on' de indefinido

Soy nuevo en el nodo... Si necesita algo más, por favor comente.

MI CÓDIGO :

 io.socket.on('connection', function(socket){ console.log('유저 접속 됨') socket.on('send', function(data){ console.log('전달된 메시지: ', data.msg) }) socket.on('disconnect', function(){ console.log('접속 종료') }) })

y esta salida de consola:

 TypeError: Cannot read property 'on' of undefined at Object.<anonymous> (D:\Project\NodeJS\node-chat\app.js:32:11) at Module._compile (internal/modules/cjs/loader.js:1085:14) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10) at Module.load (internal/modules/cjs/loader.js:950:32) at Function.Module._load (internal/modules/cjs/loader.js:790:12) at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:76:12)
about 4 years ago · Juan Pablo Isaza
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