I think you have configured default home page as → Admin_Overview page, something like below.
whereas Admin_Overview page has a page parameter ‘Dashboard’.
So the problem is tool is not able determine which Dashboard object need to pass to Admin_Overview page and throwing error.
What you can do is you can create microflow which will create Dashboard object first and then
use show page action to navigate to Admin_Overview page , example below →
and configure this microflow as Default home page instead of Admin_Overview page.
I think this will solve above issue.
Instead of errors, can you send navigation