Error C2039: "value" is not a member of "boost::proto"

I installed boost and cpp-netlib using vcpkg,but when I'm using it by ```#include “boost/network/uri.hpp"``` ,I got error C2039.The error is reported at "F:\vcpkg\installed\x64-windows\include\boost\proto\generate.hpp",in line239 and line 248.
IDE: Viaual Studio Professional 2019
System: Windows 10 x64