How To Change Port For Theme App Extension In Shopify Public App

[Faateh]

I am using node-template for Shopify public app and I installed theme extensions in it. I am trying to run it locally but I get the following error 

When I go to this address i get the following error 

I did remove the star_rating.liquid file and added my own file but why is it catching only this file?  I deployed it using yarn deploy command and it deployed successfully but if I start it locally then it gives the above error. Kindly tell me what seems to be the problem. How to change it's port?