undefined reference to `liboai::Conversation::Conversation()'

[lxj123-abc]

When I run the code in the diagram, I get an error：

/usr/bin/ld: robot.cpp:(.text+0x173c): undefined reference to liboai::Conversation::AddUserData(std::basic_string_view<char, std::char_traits<char> >) &' /usr/bin/ld: robot.cpp:(.text+0x177b): undefined reference to liboai::Authorization::SetKeyEnv(std::basic_string_view<char, std::char_traits >)'
/usr/bin/ld: robot.cpp:(.text+0x18ed): undefined reference to liboai::ChatCompletion::create(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, liboai::Conversation&, std::optional<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::optional<float>, std::optional<float>, std::optional<unsigned short>, std::optional<std::function<bool (std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, long, liboai::Conversation&)> >, std::optional<std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, std::optional<unsigned short>, std::optional<float>, std::optional<float>, std::optional<std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, signed char, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, signed char> > > >, std::optional<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >) const &' /usr/bin/ld: robot.cpp:(.text+0x1973): undefined reference to liboai::Conversation::Update(liboai::Response const&) &'
/usr/bin/ld: robot.cpp:(.text+0x1992): undefined reference to liboai::Conversation::GetLastResponse[abi:cxx11]() const &' /usr/bin/ld: CMakeFiles/robot.dir/src/robot.cpp.o: in function liboai::Authorization::Authorizer()':
robot.cpp:(.text._ZN6liboai13Authorization10AuthorizerEv[_ZN6liboai13Authorization10AuthorizerEv]+0x4a): undefined reference to liboai::Authorization::~Authorization()' /usr/bin/ld: CMakeFiles/robot.dir/src/robot.cpp.o: in function std::pair<std::__cxx11::basic_string<char, std::char_traits, std::allocator > const, liboai::netimpl::components::EncodedAuthentication>::~pair()':
robot.cpp:(.text._ZNSt4pairIKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEN6liboai7netimpl10components21EncodedAuthenticationEED2Ev[_ZNSt4pairIKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEN6liboai7netimpl10components21EncodedAuthenticationEED5Ev]+0x1c): undefined reference to `liboai::netimpl::components::EncodedAuthentication::~EncodedAuthentication()'

How can I solve this tricky problem that has been bothering me for two days?，thank you！