v2/v3 clipboard support

CustomizePlus/UI/Windows/PopupSystem.cs

@@ -22,6 +22,8 @@ public class PopupSystem
     {
         _logger = logger;
         _configuration = configuration;
+
+        RegisterPopup("action_error", "Error while performing selected action.\nDetails have been printed to Dalamud log (/xllog in chat).");
     }
 
     public void RegisterPopup(string name, string text, bool displayOnce = false, Vector2? sizeDividers = null)