diff --git a/cmd/iface/main.go b/cmd/iface/main.go
index 55f4d71..1795f53 100644
--- a/cmd/iface/main.go
+++ b/cmd/iface/main.go
@@ -15,21 +15,23 @@ func main(){
 	serv := ws.CreateServer("0.0.0.0", 4444)
 
 	/* (2) Bind default controller */
-	err := serv.BindDefault(func(c ws.Client, f ws.Frame){
+	err := serv.BindDefault(func(c *ws.Client, f *ws.Frame){
 		fmt.Printf("Default controller")
 	})
 	if err != nil { panic(err) }
 
 	/* (3) Bind to URI */
-	err = serv.Bind("/channel/./room/./", func(c ws.Client, f ws.Frame){
+	err = serv.Bind("/channel/./room/./", func(c *ws.Client, f *ws.Frame){
 		fmt.Printf("URI controller")
 	})
 	if err != nil { panic(err) }
 
 	/* (4) Launch the server */
-	serv.Launch()
-
-
+	err = serv.Launch()
+	if err != nil {
+		fmt.Printf("[ERROR] %s\n", err)
+		return
+	}
 
 
 	fmt.Printf("+ elapsed: %1.1f us\n", float32(time.Now().UnixNano()-startTime)/1e3)