Deployed to IIS. allm I get is a blank page

I have created an app and used the zip to deploy the app to an IIS server.
When I try to run the app , all I get is a blank page, and there is no log for me to se any erros (as talked about in the docs).

Did you check your browser developer tools for any JS errors of failed HTTP requests?

Yes, and there are no errors of any kind.

Unfortunately we haven't encountered such an error before. No idea what could that be. You can try deploying from Visual Studio Professional to see if it makes a difference.