IPbxAdminApi::Create results in undefined reference error                
                
    When extending the sample project with following lines below to use the PbxAdminApi, I get a compilation/build error in Visual Studio "undefined reference to `IPbxAdminApi::Create(char const*, char const*)'". Code is according to SDK documentation.Why do I get this error and how to solve it?
 
                
                                                                                            //Set logging flags in the base AppInstance object logFlags |= LOG_APP; logFlags |= LOG_APP_WEBSOCKET; logFlags |= LOG_DATABASE;
RegisterJsonApi(this);
 pbxAdminApi = IPbxAdminApi::Create("xqting.be", "inno13-pbx");
 RegisterJsonApi(pbxAdminApi);
 Log("App instance constructed"); 

