iOS Bundle Signing tab shows an error

When clicking on ios project properties iOS Bundle Signing tab shows an error "Value cannot be null. Parameter name: source ".
When clicking second time on this tab there is a different error "An error occurred trying to load the page. Unable to create the designer. File is already opened in an incompatible editor."
When trying to connect to Mac Build Host, the connection succeeds, but seconds after Visual Studio just crashes.
Visual Studio and Xamarin is up to date on both Windows and Mac.
Previously worked fine with developer provisioning, the problem appeared when tried to configure for Ad-Hoc provisioning.
Please, help me to figure out.