ros1_bridge generating custom messages but when running, throws error "No template specialization for the pair"

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I have successfully ran ros1_bridge's dynamic_bridge and passed messages between ROS and ROS2, but cannot quite figure out how to implement custom message definitions. I am using 64-bit Ubuntu 16.04 LTS, ROS Kinetic, and ROS2 Ardent.

Below is my general file structure:

<path_to_folder>
---ros2_ws
------[workspace built from [this](https://github.com/ros2/ros2/wiki/Ament-Tutorial) tutorial, with ardent branch's ros2.repos file]
---my_ros2_ws
------[other ros2 stuff I'm doing that will later utilize the ros1_bridge]
---ros1_bridge_ws_overlay
------catkin_ws_overlay
---------src
------------CMakeLists.txt
------------my_interfaces
---------------CMakeLists.txt
---------------package.xml
---------------msg
------------------MyCustom.msg
---------------src
------------------my_publisher.cpp
------ros2_ws_overlay
---------src
------------my_interfaces
---------------CMakeLists.txt
---------------package.xml
---------------msg
------------------MyCustom.msg
---------------src
------------------my_subscriber.cpp

To specify, I've named the package and message file the same for each workspace, and the message file itself is a simple definition with a couple of float64[] list variables (I copied the exact contents so it matches).

My process to build all of this is as follows (each build is done in a separate terminal):

**Process for building ros1_bridge_ws_overlay/catkin_ws_overlay:
  $ source /opt/ros/kinetic/setup.bash
  $ cd <path_to_folder>/ros1_bridge_overlay/catkin_ws_overlay/
  $ catkin_make

The output for catkin_make clearly generates my custom message and link's my executable.

**Process for building ros1_bridge_ws_overlay/ros2_ws_overlay:
  $ source /opt/ros/ardent/setup.bash
  $ cd <path_to_folder>/ros1_bridge_overlay/ros2_ws_overlay/
  $ ament build

Again, the output clearly generates my custom messages (I can see them in install/include/my_interfaces/msg/) and links my executable.

Now that I've generated my custom messages, I go to my ros2_ws and delete the folder ros2_ws/build/ros1_bridge. Then, to rebuild the ros1_bridge, I do as follows:

**Process for rebuilding ros1_bridge:
  $ source <path_to_folder>/ros1_bridge_overlay/catkin_ws_overlay/devel/setup.bash
  $ source <path_to_folder>/ros1_bridge_overlay/ros2_ws_overlay/install/local_setup.bash
  $ cd <path_to_folder>/ros2_ws
  $ src/ament/ament_tools/scripts/ament.py build --build-tests --symlink-install

From this, I see important output such as:

[  2%] Generating generated/get_factory.cpp, generated/get_mappings.cpp, generated/nav_msgs_factories.cpp, generated/actionlib_msgs_factories.cpp, generated/logging_demo_factories.cpp, generated/trajectory_msgs_factories.cpp, generated/test_msgs_factories.cpp, generated/tf2_msgs_factories.cpp, generated/stereo_msgs_factories.cpp, generated/lifecycle_msgs_factories.cpp, generated/visualization_msgs_factories.cpp, generated/geometry_msgs_factories.cpp, generated/shape_msgs_factories.cpp, generated/std_msgs_factories.cpp, generated/rcl_interfaces_factories.cpp, generated/std_srvs_factories.cpp, generated/diagnostic_msgs_factories.cpp, generated/builtin_interfaces_factories.cpp, generated/sensor_msgs_factories.cpp, generated/example_interfaces_factories.cpp, generated/pendulum_msgs_factories.cpp, generated/composition_factories.cpp, generated/my_interfaces_factories.cpp

and

[ 84%] Building CXX object CMakeFiles/ros1_bridge.dir/generated/my_interfaces_factories.cpp.o

At this point, I would guess that my custom message is being processed and built properly. Then, I run all the executables necessary to bring up the bridge (again, all of these are in separate terminals), as so:

**Process for starting roscore:
  $ source /opt/ros/kinetic/setup.bash
  $ source <path_to_folder>/ros1_bridge_overlay/catkin_ws_overlay/devel/setup.bash
  $ roscore

**Process for starting dynamic_bridge:
  $ source /opt/ros/kinetic/setup.bash
  $ source <path_to_folder>/ros1_bridge_overlay/catkin_ws_overlay/devel/setup.bash
  $ source /opt/ros/ardent/setup.bash
  $ source <path_to_folder>/ros2_ws/install/local_setup.bash
  $ source <path_to_folder>/ros1_bridge_overlay/ros2_ws_overlay/install/local_setup.bash
  $ ros2 run ros1_bridge dynamic_bridge

**Process for starting ROS publisher:
  $ source /opt/ros/kinetic/setup.bash
  $ source <path_to_folder>/ros1_bridge_overlay/catkin_ws_overlay/devel/setup.bash
  $ rosrun my_interfaces test_publisher // How ...