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I believe I just discovered the answer (or one part to the answer) to this problem.
I was getting the same error attempting to generate my app from my static content-based github project (includes index.htm, main.css and *.js files).
I went back to my github repo renamed my index.htm to index.html and tried the app wizard again and it recognized my static-content web app and built my app.
It seems the wizard wants the content to have extension .HTML and doesn’t recognize the file otherwise. This could be true for index.php or whatever too.
I’ve also document this here in the DO community.
This comment has been deleted
@omidshojaee I hit the same speed bump myself, going to try the CLI instead. I’ll report back if it I get it working that way!
For context, i’m trying to deploy a go app that uses a custom config (Dockerfile is not at the root).