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I was having this problem AFTER I tried to implement dynamic_reconfigure.

The DR build system put an extra <package_name> folder under the <package_name>/src folder.

As I has followed the tutorials, my python node.py code was also in the src folder, which caused python to try and load from the newly created folder instead of the main folder.

To fix this: move node.py files into a <package_name>/nodes folder

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