Here is the error message

Using these message generators: gencpp;geneus;genlisp;gennodejs;genpy CMake Error at /home/mackdogg/my_ws/build/my_pack/cmake/my_pack-genmsg.cmake:3 (message): Could not find messages which '/home/mackdogg/my_ws/src/my_pack/msg/Complex.msg' depends on. Did you forget to specify generate_messages(DEPENDENCIES ...)?

Cannot locate message [loat32] in package [my_pack] with paths [['/home/mackdogg/my_ws/src/my_pack/msg']] Call Stack (most recent call first): /opt/ros/noetic/share/genmsg/cmake/genmsg-extras.cmake:307 (include) my_pack/CMakeLists.txt:76 (generate_messages)

Here is what I input:

cmake_minimum_required(VERSION 3.0.2) project(my_pack)

Compile as C++11, supported in ROS Kinetic and newer

add_compile_options(-std=c++11)

Find catkin macros and libraries

if COMPONENTS list like find_package(catkin REQUIRED COMPONENTS xyz)

is used, also find other catkin packages

find_package(catkin REQUIRED COMPONENTS roscpp rospy std_msgs message_generation )

System dependencies are found with CMake's conventions

find_package(Boost REQUIRED COMPONENTS system)

Uncomment this if the package has a setup.py. This macro ensures

modules and global scripts declared therein get installed

See http://ros.org/doc/api/catkin/html/us...

catkin_python_setup()

#

Declare ROS messages, services and actions

#

To declare and build messages, services or actions from within this

package, follow these steps:

* Let MSG_DEP_SET be the set of packages whose message types you use in

your messages/services/actions (e.g. std_msgs, actionlib_msgs, ...).

* In the file package.xml:

* add a build_depend tag for "message_generation"

* add a build_depend and a exec_depend tag for each package in MSG_DEP_SET

* If MSG_DEP_SET isn't empty the following dependency has been pulled in

but can be declared for certainty nonetheless:

* add a exec_depend tag for "message_runtime"

* In this file (CMakeLists.txt):

* add "message_generation" and every package in MSG_DEP_SET to

find_package(catkin REQUIRED COMPONENTS ...)

* add "message_runtime" and every package in MSG_DEP_SET to

catkin_package(CATKIN_DEPENDS ...)

* uncomment the add_*_files sections below as needed

and list every .msg/.srv/.action file to be processed

* uncomment the generate_messages entry below

* add every package in MSG_DEP_SET to generate_messages(DEPENDENCIES ...)

Generate messages in the 'msg' folder

add_message_files( FILES Complex.msg )

Generate services in the 'srv' folder

add_service_files(

FILES

Service1.srv

Service2.srv

)

Generate actions in the 'action' folder

add_action_files(

FILES

Action1.action

Action2.action

)

Generate added messages and services with any dependencies listed here

#

Declare ROS dynamic reconfigure parameters

#

generate_messages( DEPENDENCIES std_msgs )

catkin_package( CATKIN_DEPENDS rospy message_runtime )

#

catkin specific configuration

#

The catkin_package macro generates cmake config files for your package

Declare things to be passed to dependent projects

INCLUDE_DIRS: uncomment this if your package contains header files

LIBRARIES: libraries you create in this project that dependent projects also need

CATKIN_DEPENDS: catkin_packages dependent projects also need

DEPENDS: system dependencies of this project that dependent projects also need

INCLUDE_DIRS include

LIBRARIES my_pack

CATKIN_DEPENDS rospy

DEPENDS system_lib

#

Build

#

Specify additional locations of header files

Your package locations should be listed before other locations

include_directories(

include

${catkin_INCLUDE_DIRS} )

Declare a C++ library

add_library(${PROJECT_NAME}

src/${PROJECT_NAME}/my_pack.cpp

)

Add cmake target dependencies of the library

as an example, code may need to be generated before ...