node.js error message events.js:183 throw er; // Unhandled 'error' event

Question

Playing around Microsoft\'s botframework, when I try to run the app.js file, which is the main file of the bot, the first time is fine, after I close the bot emulator, and a

Answer 1

This happens when you open another project without having closed the one you were already using, remember to always use Ctrl+c when you finish using a project. Try rebooting your PC and it should work again. At least that's what worked for me.

Answer 2

Even I was also getting the error while running node server. i.e events.js:183 throw er; // Unhandled 'error' event ^ In my case, I was getting that error because I had changed Mysql port number 3306 to 3307 while installing. I recovered from from that error by changing Mysql port number to 3306, and now its running.

Answer 3

If you are on mac, to make sure nothing is running on the same port, do:

killall node

and restart your app.

Answer 4

You might be running some other application on the same port, and it is still running. So you can't run two applications on the same port.

Answer 5

This is a very common issue and can be easily fixed by either of the below methods.

1. Try to close the process that is using your port.

   netstat -tulnp | grep <port_number>

2. Installing the below pakcage fixed it for me forever.

   npm install ws@3.3.2 --save-dev --save-exact

3. Run this command in your terminal :

   echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf && sudo sysctl -p

   For Arch Linux add this line to /etc/sysctl.d/99-sysctl.conf:

   fs.inotify.max_user_watches=524288

   Then execute:

   sysctl --system

   This will also persist across reboots.

   https://github.com/guard/listen/wiki/Increasing-the-amount-of-inotify-watchers#the-technical-details

Either one of the solutions will work . If not then restart your system and check again.

Answer 6

Try specify a different port before you run the node.js application.

For example, if you have collision on port 3978, set a different port before you start the server.js:

export PORT=3979