New installation: Page not found

Hello

I feel a little stupid right now: I created two sites for a new website: the default site for English and the second for German.

For both sites I selected the installed and enabled theme.

The theme consists of the file “default.htm”, which currently consists only of an HTML framework.

When I access the page I can expect a blank page. Instead, the message “Page Not Found” appears. The message comes from the CMS.

It’s probably some small mistake, but I don’t check it. Does anyone have any ideas?

Thanks

Cheers