Unsolved Code 404 -- Message file not found

[TMJJ001]

Dear,

my first try on QT WASM. So probably some stupid mistake.
I just created a new empty qt quick application. when I compile it with WASM, I get error code 404. HTML file not found.
When I go to the corresponding folder, I also don't find the HTML file.

Below you can find kit + compiler

Can somebody give me some hints please?

Thanks!