diff --git a/Calendar/PanelDesign.py b/Calendar/PanelDesign.py
index c4d89ca..c8b46b0 100644
--- a/Calendar/PanelDesign.py
+++ b/Calendar/PanelDesign.py
@@ -12,4 +12,7 @@ class PanelDesign (DesignEntity):
         raise NotImplementedError("Functions needs to be implemented")
 
     def add_rssfeed (self, rss):
+        raise NotImplementedError("Functions needs to be implemented")
+
+    def add_taks (self, tasks):
         raise NotImplementedError("Functions needs to be implemented")
\ No newline at end of file