App Script Deployment (Executable API) URL does not work

I have created an APP Script project that take validations for my Google Sheets attached to it. I want to run these functions from Node js app where I get the error 'Requested entity was not found.' Also I have noticed, the generated URL for API executable deployment not found when posted in browser. I can publish new functions into same project, but unable to call these functions for further. What might be the most common cause of this API URL not working?