Build fails with C3861

I imagine this is a fairly simple issue but my C++ is incredibly weak. I've clone the repo but upon attempting a build in VS2019 I get the following:

Severity Code Description Project File Line Suppression State Error C3861 '_state': identifier not found C:\Users\x\Documents\Projects\WoW\WoWOffsetDumper-master\CMakeLists.txt C:\Users\x\Documents\Projects\WoW\WoWOffsetDumper-master\src\clepta\clepta\object.hpp 76 Error C3861 '_state': identifier not found C:\Users\x\Documents\Projects\WoW\WoWOffsetDumper-master\CMakeLists.txt C:\Users\x\Documents\Projects\WoW\WoWOffsetDumper-master\src\clepta\clepta\object.hpp 63 Error C3861 '_address': identifier not found C:\Users\x\Documents\Projects\WoW\WoWOffsetDumper-master\CMakeLists.txt C:\Users\x\Documents\Projects\WoW\WoWOffsetDumper-master\src\clepta\clepta\object.hpp 74