Unity 2018.3.0f1 fresh open errors

[Tokatak]

Assets\UI.Windows.Addons\Console\Core\ConsoleManager.cs(219,43): error CS1061: 'object' does not contain a definition for 'Unwrap' and no accessible extension method 'Unwrap' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)

and

Assets\UI.Windows\AddonsDefault\WindowSystemResources\Core\UAB\Core\UABBuilder.cs(205,28): error CS1061: 'object' does not contain a definition for 'Unwrap' and no accessible extension method 'Unwrap' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)

Is framework supported?

[bestans]

I got the same problem in Unity 2018.3.6f1