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I solved this problem by modifving plugin_description.xml

<library path="libtiffer_panel">
  <class name="Tiffer"
         type="Tiffer::TifferPanel"
         base_class_type="rviz::Panel">
    <description>
      Tiffer's simple panel.
    </description>
  </class>
</library>

Just modify the type to what you change in your code.

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