The server "Server Name" was unable to process the request.

Hi!

NAV 2013 R2
After NAV upgrade from first install disc up to last RoleUp upgrade (RU 10, ver. 7.1.37563.0)

The RTC has crashed when I use function "Help -> About this page".
Error message: "The server "Server Name" was unable to process the request. Close the application and start it again."

In the event log I found this message:
Type: System.UriFormatException
Message: Invalid URI: The hostname could not be parsed.
StackTrace:
at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)
at Microsoft.Dynamics.Nav.Runtime.ALSystemOperatingSystem.GetUrlCore(NavClientType clientType, String company, NavObjectType objectType, Int32 objectId, NavRecord record, Boolean useFilter)
at Microsoft.Dynamics.Nav.Service.NSService.GetServicesUrl(NavClientType clientType, NavObjectType objectType, Int32 objectId, NavRecordState recordState, Boolean useFilter)
at SyncInvokeGetServicesUrl(Object , Object[] , Object[] )
at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
at Microsoft.Dynamics.Nav.Service.ServiceOperationInvoker.ErrorMappingCombinator(ServiceOperation innerOperation, NSServiceBase serviceInstance, Object[] inputs, Object[]& outputs)
Source: System
HResult: -2146233033

I upgraded:
- NST
- RTC
- HelpServer
- ADCS

an idea, experience?

Thanks!