Update app.py

app.py

@@ -7,8 +7,10 @@ server_logic = AppServerLogic()
 example_db = {"USER":"TestUser","PASS":"TestPass"}
 
 def login_fn(username,password):
-    if username==example_db.USER and password==example_db.PASS:
+    if username==example_db.get("USER") and password==example_db.get("PASS")
         return gr.Update("### Logged in")
+    else:
+        return gr.Update("### Incorrect Username or Password")
 
 def process_image_and_display_payload(image):
     if image is None: