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Compare your main.cpp to my_plugin.cpp. You don't have this line at the bottom:

PLUGINLIB_DECLARE_CLASS(rqt_gauges, MyPlugin, rqt_gauges::MyPlugin, rqt_gui_cpp::Plugin)

You also never construct a Widget object, and you're missing this function (which seems rather important):

void MyPlugin::initPlugin(qt_gui_cpp::PluginContext& context)

So go back and spend some time fixing those obvious issues. I think we would be more motivated to help if you upvoted good answers, too.

Compare your main.cpp to my_plugin.cpp. You don't have this line at the bottom:

PLUGINLIB_DECLARE_CLASS(rqt_gauges, MyPlugin, rqt_gauges::MyPlugin, rqt_gui_cpp::Plugin)

You also never construct a Widget object, and And you're missing this function (which seems rather important):

void MyPlugin::initPlugin(qt_gui_cpp::PluginContext& context)

So go back and spend some time fixing those obvious issues. I think we would be more motivated to help if you upvoted good answers, too.