Hi Nibu,
The licenses secured in your Activation Key were verified and we noticed that no license of Descon was listed therein. I guess, you might have configured Descon License by mistake. Therefore to get rid of reported error, please uncheck Descon License in STAAD SELECT XM License Configuration page as shown in attached JPG. You may reach to the configuration page by navigating through Start->All Program->Bentley Engineering->STAAD.Pro V8i->SELECT License Tools->STAAD SELECT XM License configuration OR C:\SproV8i\HardLock\LicenseAssistant.exe
Regards,
BM