Update app.py

app.py

@@ -25,7 +25,7 @@ def validate_token(token):
         if user["token"] == token:
             expiration_time = datetime.fromisoformat(user["token_expiration_time"])
             if datetime.now() < expiration_time:
-                return True
+                return True, None  # Token is valid, no error message
             else:
                 return False, "Token has expired."
     return False, "Token not found."