I keep on getting the error message in reference to generate_messages

asked 2022-03-14 04:47:01 -0600

MackDoggy gravatar image

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


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...



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






Generate actions in the 'action' folder






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




DEPENDS system_lib




Specify additional locations of header files

Your package locations should be listed before other locations



${catkin_INCLUDE_DIRS} )

Declare a C++ library




Add cmake target dependencies of the library

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

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@MackDoggy this question is very difficult to read. Could you please edit and use the 101010 button to format the code snippets and error messages? Parsing CMakeLists.txt files is also much easier if you remove all of the boilerplate comment. Also, the error you posted seems like it's very likely an issue with Complex.msg in the my_pack package. Perhaps you spelled float32 incorrectly? Regardless if the issue is that message definition, it would be very helpful for you to add that .msg file to the question

jarvisschultz gravatar image jarvisschultz  ( 2022-03-14 09:52:06 -0600 )edit