CMake error when building rclcpp

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I got some errors when building rclcpp using colcon build. The error message is shown below. Any idea where the problem is? I had sourced ${ROS_WS}/install/setup.bash before running colcon build.

 root@48fcb45ebd09:/opt/ros_ws# cat log/latest_build/rclcpp/stderr.log
CMake Error at test/CMakeLists.txt:3 (find_package):
  By not providing "Findtest_msgs.cmake" in CMAKE_MODULE_PATH this project
  has asked CMake to find a package configuration file provided by
  "test_msgs", but CMake did not find one.

  Could not find a package configuration file provided by "test_msgs" with
  any of the following names:

    test_msgsConfig.cmake
    test_msgs-config.cmake

  Add the installation prefix of "test_msgs" to CMAKE_PREFIX_PATH or set
  "test_msgs_DIR" to a directory containing one of the above files.  If
  "test_msgs" provides a separate development package or SDK, be sure it has
  been installed.