Xafari Samples have errors

Hi I tried to open the Xafari example located on the public folder but all have errors like
Severity Code Description Project File Line Suppression State
Error CS0246 The type or namespace name 'IManagedOperation' could not be found (are you missing a using directive or an assembly reference?) Xafari.Northwind C:\Users\Public\Documents\Xafari Framework v17.1.5011 Demos\Northwind\CS\Xafari.Northwind\Operations\Operation3.cs 33 N/A
Severity Code Description Project File Line Suppression State
Error CS0246 The type or namespace name 'XafariSecuritySystemRole' could not be found (are you missing a using directive or an assembly reference?) Xafari.Northwind C:\Users\Public\Documents\Xafari Framework v17.1.5011 Demos\Northwind\CS\Xafari.Northwind\Security\InheritedRole.cs 7 N/A
Severity Code Description Project File Line Suppression State
Error CS0234 The type or namespace name 'BC' does not exist in the namespace 'Xafari' (are you missing an assembly reference?) Xafari.Northwind C:\Users\Public\Documents\Xafari Framework v17.1.5011 Demos\Northwind\CS\Xafari.Northwind\Updater.cs 6 N/A
Severity Code Description Project File Line Suppression State
Error CS0246 The type or namespace name 'XafariModuleUpdater' could not be found (are you missing a using directive or an assembly reference?) Xafari.Northwind C:\Users\Public\Documents\Xafari Framework v17.1.5011 Demos\Northwind\CS\Xafari.Northwind\Updater.cs 11 N/A
Severity Code Description Project File Line Suppression State
Error CS0115 'CategoryAttributeLocalizer.ResourceName': no suitable method found to override Xafari.Northwind C:\Users\Public\Documents\Xafari Framework v17.1.5011 Demos\Northwind\CS\Xafari.Northwind\Localization\CategoryAttributeLocalizer.cs 13 N/A
Severity Code Description Project File Line Suppression State
Error CS0308 The non-generic type 'CategoryAttributeLocalizer' cannot be used with type arguments Xafari.Northwind C:\Users\Public\Documents\Xafari Framework v17.1.5011 Demos\Northwind\CS\Xafari.Northwind\Localization\CategoryAttributeLocalizer.cs 11 N/A
error CS0234: The type or namespace name 'BC' does not exist in the namespace 'Xafari' (are you missing an assembly reference?)

all Have the same errors on every example with the same type it is so many that I could not copy everything. What could be the cause , I just opened the samples first time upon installing.

Thanks!