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Please add your cmakelists file.

I'm going to take a good guess you haven't generated the messages correctly.

add_service_files(DIRECTORY srvs FILES ServiceFile.srv ) generate_messages( DEPENDENCIES std_msgs other_deps )

also add as a catkin dep. message_generation

I forget if you need this in python, but here it is anyhow. add_dependencies(${PROJECT_NAME} ${PROJECT_NAME}_generate_messages_cpp)