CMake error when compiling Cesium Native

hello, something wrong when i build the cesium in o3de like this:

CMake Error at D:/code/o3de/cesium/cesium-o3de/Code/CMakeLists.txt:17 (file):
file failed to open for reading (No such file or directory):
CMake Error at D:/code/o3de/o3de/cmake/3rdPartyPackages.cmake:637 (message):
ly_associate_package was called without the PACKAGE_HASH argument, this is

i can not find the Install dir in External.

The directory is created once you build cesium-native and other third party in External directory. You can find the instruction for building the plugin in this doc cesium-o3de/ at main · CesiumGS/cesium-o3de · GitHub.