Solved! Go to Solution.
esri|PopUpRenderer { skin-class: ClassReference("com.esri.viewer.skins.PopUpRendererSkin_Subtypes"); }
esri|PopUpRenderer { skin-class: ClassReference("com.esri.viewer.skins.PopUpRendererSkin_Subtypes"); }
esri|PopUpRenderer
{
skin-class: ClassReference("com.esri.viewer.customskins.PopUpRendererSkin");
}