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According to the nm documentation, the U at the beginning of the line means that symbol is undefined.

_ZN15zed_ros_wrapper17ZedWrapperNodeletC1Ev is a mangled C++ name, so I put it through c++filt to get the actual function name for the undefined symbol: zed_ros_wrapper::ZedWrapperNodelet::ZedWrapperNodelet()

It looks like you haven't implemented the no-argument constructor for your nodelet.