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If you have already installed a previous version of ROS (like foxy), that might be the source of the problem. It's because value_to_yaml function is introduced recently, and the compiler may prioritize the older version of ROS, resulting the 'not declared' error. To solve this, I just had to comment out source /opt/ros/foxy/setup.bash from my ~/.bashrc file and restart the terminal. Hope this helps.

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