icon fix that doesn't work

katrain.py

@@ -1,6 +1,7 @@
 from kivy.config import Config  # isort:skip
-
 Config.set("input", "mouse", "mouse,multitouch_on_demand")  # isort:skip  # no red dots on right click
+ICON = "img/icon.png"
+Config.set("kivy", "window_icon",ICON)  # isort:skip  # set icon before Window is imported
 
 import signal
 import os
@@ -295,8 +296,9 @@ class KaTrainApp(App):
     gui = ObjectProperty(None)
 
     def build(self):
-        self.icon = "./img/icon.png"
+        self.icon = ICON # how you're supposed to set an icon
         self.gui = KaTrainGui()
+        print(self.get_application_icon())
         Window.bind(on_request_close=self.on_request_close)
         return self.gui