Unknown CMake command "rosidl_get_typesupport_target"

edit

when I build galactic from source, ran into an issue like below:

Starting >>> demo_nodes_cpp_native
--- stderr: test_communication                                                                                    
CMake Error at CMakeLists.txt:122 (rosidl_get_typesupport_target):
  Unknown CMake command "rosidl_get_typesupport_target".
Call Stack (most recent call first):
  CMakeLists.txt:420 (custom_executable)


---
Failed   <<< test_communication [2.97s, exited with code 1]
Aborted  <<< demo_nodes_cpp_native [0.68s]

Appreciate anyone help to find the root cause. Thanks!

Rongcai