Failing to start networking section backend

I followed the tutorial step by step and only changed the api address as suggested but when i run node index.js i get this error

Cannot find module ‘C:\Users\lenovo\Desktop\2.Mosh\2.Advanced\4.Networking\Backend\index.js’

Its strange because the file is there i can see it but i do not understand why it is saying it isnt there. What could be the problem and how can i solve this issue?