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Guys, this error is happening to me when using the socket.io: "io is not defined". Already link the CDN socket.io and locally; I’ve used and "disfigured" the Express and nothing.
The interesting thing is that when I open the source in the browser (CRTL + U) and click on the link of the client’s src file it says that it did not find the socket-io.js file (if it is linking locally the file)
Someone’s been through it?
The error occurs where? Add your code without it makes it difficult to locate the problem.
– user28595