Fix small error
diff --git a/xos/vpn/models.py b/xos/vpn/models.py
index 3f23e72..fd86a37 100644
--- a/xos/vpn/models.py
+++ b/xos/vpn/models.py
@@ -45,7 +45,7 @@
             "server_key",
             self.default_attributes['server_key'])
 
-    @display_message.setter
+    @server_key.setter
     def display_message(self, value):
         self.set_attribute("server_key", value)