ERR_CONNECTION_REFUSED

[jonathanlayssard]

Just downloaded the program to test it out. Im getting this error shown in my console:

GET http://localhost:4000/socket.io/?EIO=3&transport=polling&t=M1BZv4g net::ERR_CONNECTION_REFUSED . zone.js:2933

This is straight out the zip file, I am able to log into the chats but i can not post any messages?
Im not sure what the fix is for this, Im pretty new to the MEAN stack application. Trying to find a decent chat tool to learn from. Is there a fix for this error?