By default the role Guests has none top level tab configured, but the same error could occur for any role without any top level tab configured.
This article describes a quick solution to this issue.
In the Staging AdminUI, open the Page Layout menu option, select the Guests role, and Add Page Layout. In the following page, select the Dashboard option
and fill it out in this way
Finally push to UAT to check the result.
|Summary||Error pushing from STG to UAT|