Building Custom Message on Dashing Fails

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When I run colcon build to generate a custom message on Dashing, I get the following error:

Starting >>> druai_msg
--- stderr: druai_msg                         
CMake Error at /opt/ros/dashing/share/rosidl_adapter/cmake/rosidl_adapt_interfaces.cmake:60 (message):
  execute_process(/usr/bin/python3 -m rosidl_adapter --package-name druai_msg
  --arguments-file
  /home/brutusdev/ros2/test_ws/build/druai_msg/rosidl_adapter__arguments__druai_msg.json
  --output-dir
  /home/brutusdev/ros2/test_ws/build/druai_msg/rosidl_adapter/druai_msg
  --output-file
  /home/brutusdev/ros2/test_ws/build/druai_msg/rosidl_adapter/druai_msg.idls)
  returned error code 1:

  Traceback (most recent call last):

    File "/usr/lib/python3.6/runpy.py", line 193, in _run_module_as_main
      "__main__", mod_spec)
    File "/usr/lib/python3.6/runpy.py", line 85, in _run_code
      exec(code, run_globals)
    File "/opt/ros/dashing/lib/python3.6/site-packages/rosidl_adapter/__main__.py", line 19, in <module>
      sys.exit(main())
    File "/opt/ros/dashing/lib/python3.6/site-packages/rosidl_adapter/main.py", line 55, in main
      pathlib.Path(relative_path), output_dir)
    File "/opt/ros/dashing/lib/python3.6/site-packages/rosidl_adapter/__init__.py", line 20, in convert_to_idl
      package_dir, package_name, interface_file, output_dir / 'msg')
    File "/opt/ros/dashing/lib/python3.6/site-packages/rosidl_adapter/msg/__init__.py", line 28, in convert_msg_to_idl
      msg = parse_message_string(package_name, input_file.stem, content)
    File "/opt/ros/dashing/lib/python3.6/site-packages/rosidl_adapter/parser.py", line 522, in parse_message_string
      msg = MessageSpecification(pkg_name, msg_name, fields, constants)
    File "/opt/ros/dashing/lib/python3.6/site-packages/rosidl_adapter/parser.py", line 373, in __init__
      pkg_name + PACKAGE_NAME_MESSAGE_TYPE_SEPARATOR + msg_name)
    File "/opt/ros/dashing/lib/python3.6/site-packages/rosidl_adapter/parser.py", line 196, in __init__
      raise InvalidResourceName(self.type)

  rosidl_adapter.parser.InvalidResourceName: druai

Call Stack (most recent call first):
  /opt/ros/dashing/share/rosidl_cmake/cmake/rosidl_generate_interfaces.cmake:130 (rosidl_adapt_interfaces)
  CMakeLists.txt:24 (rosidl_generate_interfaces)


---
Failed   <<< druai_msg  [ Exited with code 1 ]

package.xml

<package format="3">
  <name>druai_msg</name>
  <version>0.7.3</version>
  <description>Examples of custom message handling</description>
  <maintainer email="TimCraig@Druai.com">Tim Craig</maintainer>
  <license>Apache License 2.0</license>
  <author>Tim Craig</author>

  <buildtool_depend>ament_cmake</buildtool_depend>

  <build_depend>builtin_interfaces</build_depend>
  <build_depend>rosidl_default_generators</build_depend>
  <exec_depend>builtin_interfaces</exec_depend>
  <exec_depend>rosidl_default_runtime</exec_depend>

  <member_of_group>rosidl_interface_packages</member_of_group>

  <export>
    <build_type>ament_cmake</build_type>
  </export>
</package>

CMakeList.txt

cmake_minimum_required(VERSION 3.5)
project(druai_msg)

# Default to C++14
if(NOT CMAKE_CXX_STANDARD)
  set(CMAKE_CXX_STANDARD 14)
endif()

if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  add_compile_options(-Wall -Wextra -Wpedantic)
endif()

find_package(ament_cmake REQUIRED)
#find_package(rclcpp REQUIRED)
#find_package(std_msgs REQUIRED)

#Needed to handle custom messages
find_package(builtin_interfaces REQUIRED)
find_package(rosidl_default_generators REQUIRED)

#set(FastRTPS_INCLUDE_DIR:PATH /opt/ros/dashing/include)

#Generate the include file and other support for the custom message
rosidl_generate_interfaces(${PROJECT_NAME}
  "msg/druai.msg"
  DEPENDENCIES builtin_interfaces)

ament_package()

Message file druai.msg, not that it seems to get that far.

string banner
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I shifted my focus to ROS2 when Dashing was released. Seems to have installed correctly. I successfully built the standard examples. Successfully built and ran my own publisher-subscriber pair for standard messages. However, when I tried to do a custom message following this tutorial which is for Crystal, it failed. It appears that the FastRTPS include files and libraries are there in /opt/ros/dashing/.....

[Tutorial video](https://www.youtube.com/watch?v=nG3IOkEOPps)

When I searched, I found something ... (more)