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The problem seems to be the following line

 #include string>

in the file

/home/emilio/catkin_ws/devel/include/emilio_arduino/Num.h

Did you by accident remote the first opening <? It should probably read #include <string>?

If this does not help you, you need to provide more information. What does you CMakeLists.txt look like? On what system (seems to be Arduino, right?), what distro? Maybe the source code of the files where you have the problem... and the msg definition...