cmake subdirectory preprocesser include error - c++

Question

.
├── CMakeLists.txt
├── main.cpp
├── lib
├── CMakeLists.txt
├── Scene.cpp
└── Scene.hpp
./CMakeLists.txt is like this.
cmake_minimum_required(VERSION 3.22)
project(myapp)
find_package(OpenCV REQUIRED)
find_package(blend2d REQUIRED)
find_package(Box2D REQUIRED)
add_subdirectory(lib)
include_directories(lib)
include_directories(${OpenCV_INCLUDE_DIR})
include_directories(${Blend2D_INCLUDE_DIRS})
include_directories(${Box2D_INCLUDE_DIR})
include_directories(${CMAKE_SOURCE_DIR})
link_directories(lib)
add_executable(${PROJECT_NAME} main.cpp)
target_link_libraries(${PROJECT_NAME} PRIVATE ${OpenCV_LIBRARIES})
target_link_libraries(${PROJECT_NAME} PRIVATE Box2D)
target_link_libraries(${PROJECT_NAME} PRIVATE blend2d)
target_link_libraries(${PROJECT_NAME} PRIVATE SCENE)
./lib/CMakeLists.txt is like this
include_directories(${OpenCV_INCLUDE_DIR})
add_library(SCENE Scene.cpp Scene.hpp)
target_link_libraries(${PROJECT_NAME} PRIVATE ${OpenCV_LIBRARIES})
The problem is in Scene.cpp, Scene.hpp
Scene.cpp is like this.
#include "Scene.hpp"
class Scene
{
...
}
the "#include <Scene.hpp>" makes an error that "#include errors detected based on information provided by the configurationProvider setting. Squiggles are disabled for this translation unit."
And Scene.hpp is like this.
#include <opencv2/opencv.hpp>
class Scene
{
....
}
the "#include <opencv2/opencv.hpp>" makes an error that "cannot open opencv2/opencv.hpp"
When I ignore the error and run 'cmake --build .',
It produces
[25%] Linking CXX executable myapp
/usr/bin/ld: canoot find -lSCENE
I'm using wsl ubuntu with vscode.
How can I solve it?