While compiling the rosbag on crystal using the instruction on the homepage, i get the following error. trying this on docker builds with ubuntu 18. can any one suggest whats going wrong here.

/types/introspection_message.cpp: In function âvoid rosbag2::cleanup_element(void*, const MessageMember&)â:
/root/ros2_ws/src/rosbag2/rosbag2/src/rosbag2/types/introspection_message.cpp:92:71: error: âROS_TYPE_WSTRINGâ is not a member of ârosidl_typesupport_introspection_cppâ
} else if (member.type_id_ == rosidl_typesupport_introspection_cpp::ROS_TYPE_WSTRING) {