Visual Studio 2019 - FreeOpcUa - comile/link errors

[kburndred]

I get the following errors during the link process.
I am trying to compile and link from within Visual Studio 2019

Rebuild started...
1>------ Rebuild All started: Project: OPCUAServer, Configuration: Release Win32 ------
1>OPCUAServer.cpp
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "class std::basic_ostream<char,struct std::char_traits > & __cdecl OpcUa::operator<<(class std::basic_ostream<char,struct std::char_traits > &,class OpcUa::Node const &)" (??6OpcUa@@yaaav?$basic_ostream@DU?$char_traits@D@std@@@std@@aav12@ABVNode@0@@z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: static struct OpcUa::DateTime __cdecl OpcUa::DateTime::Current(void)" (?Current@DateTime@OpcUa@@sa?AU12@XZ)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: class OpcUa::Node __thiscall OpcUa::Node::AddMethod(unsigned int,class std::basic_string<char,struct std::char_traits,class std::allocator > const &,class std::function<class std::vector<class OpcUa::Variant,class std::allocator > __cdecl(struct OpcUa::NodeId,class std::vector<class OpcUa::Variant,class std::allocator >)>)const " (?AddMethod@Node@OpcUa@@qbe?AV12@IABV?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@v?$function@$$A6A?AV?$vector@VVariant@OpcUa@@v?$allocator@VVariant@OpcUa@@@std@@@std@@UNodeId@OpcUa@@v12@@z@4@@z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: class OpcUa::Node __thiscall OpcUa::Node::AddVariable(unsigned int,class std::basic_string<char,struct std::char_traits,class std::allocator > const &,class OpcUa::Variant const &)const " (?AddVariable@Node@OpcUa@@qbe?AV12@IABV?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@ABVVariant@2@@z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: class OpcUa::Node __thiscall OpcUa::Node::AddObject(struct OpcUa::NodeId const &,struct OpcUa::QualifiedName const &)const " (?AddObject@Node@OpcUa@@qbe?AV12@ABUNodeId@2@ABUQualifiedName@2@@z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: void __thiscall OpcUa::Node::SetValue(class OpcUa::Variant const &)const " (?SetValue@Node@OpcUa@@QBEXABVVariant@2@@z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: class std::vector<class OpcUa::Node,class std::allocator > __thiscall OpcUa::Node::GetChildren(void)const " (?GetChildren@Node@OpcUa@@qbe?AV?$vector@VNode@OpcUa@@v?$allocator@VNode@OpcUa@@@std@@@std@@xz)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: __thiscall OpcUa::Node::Node(class OpcUa::Node const &)" (??0Node@OpcUa@@QAE@ABV01@@z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: struct OpcUa::NodeId & __thiscall OpcUa::NodeId::operator=(struct OpcUa::NodeId const &)" (??4NodeId@OpcUa@@QAEAAU01@ABU01@@z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: __thiscall OpcUa::NodeId::NodeId(struct OpcUa::NodeId const &)" (??0NodeId@OpcUa@@QAE@ABU01@@z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: __thiscall OpcUa::NodeId::NodeId(enum OpcUa::ObjectId)" (??0NodeId@OpcUa@@QAE@W4ObjectId@1@@z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: __thiscall OpcUa::NodeId::NodeId(unsigned int,unsigned short)" (??0NodeId@OpcUa@@QAE@IG@Z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: __thiscall OpcUa::Event::Event(struct OpcUa::NodeId const &)" (??0Event@OpcUa@@QAE@ABUNodeId@1@@z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: void __thiscall OpcUa::UaServer::TriggerEvent(class OpcUa::Event)" (?TriggerEvent@UaServer@OpcUa@@QAEXVEvent@2@@z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: class OpcUa::Node __thiscall OpcUa::UaServer::GetObjectsNode(void)const " (?GetObjectsNode@UaServer@OpcUa@@qbe?AVNode@2@XZ)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: class OpcUa::Node __thiscall OpcUa::UaServer::GetRootNode(void)const " (?GetRootNode@UaServer@OpcUa@@qbe?AVNode@2@XZ)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: void __thiscall OpcUa::UaServer::Stop(void)" (?Stop@UaServer@OpcUa@@QAEXXZ)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: void __thiscall OpcUa::UaServer::Start(void)" (?Start@UaServer@OpcUa@@QAEXXZ)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: unsigned int __thiscall OpcUa::UaServer::RegisterNamespace(class std::basic_string<char,struct std::char_traits,class std::allocator >)" (?RegisterNamespace@UaServer@OpcUa@@QAEIV?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@@z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: void __thiscall OpcUa::UaServer::EnableEventNotification(void)" (?EnableEventNotification@UaServer@OpcUa@@QAEXXZ)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: void __thiscall OpcUa::UaServer::SetServerURI(class std::basic_string<char,struct std::char_traits,class std::allocator > const &)" (?SetServerURI@UaServer@OpcUa@@QAEXABV?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@@z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: void __thiscall OpcUa::UaServer::SetEndpoint(class std::basic_string<char,struct std::char_traits,class std::allocator > const &)" (?SetEndpoint@UaServer@OpcUa@@QAEXABV?$basic_string@DU?$char_traits@D@std@@v?$allocator@D@2@@std@@@z)
1>OPCUAServer.obj : error LNK2001: unresolved external symbol "public: __thiscall OpcUa::UaServer::UaServer(class std::shared_ptr const &)" (??0UaServer@OpcUa@@QAE@ABV?$shared_ptr@Vlogger@spdlog@@@std@@@z)
1>C:\Users\kim\source\repos\OPCUAServer\Release\OPCUAServer.exe : fatal error LNK1120: 23 unresolved externals
1>Done building project "OPCUAServer.vcxproj" -- FAILED.
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

Any thoughts?