diff --git a/Whatsapp Message/module.php b/Whatsapp Message/module.php
index ab80773..d14ea7f 100644
--- a/Whatsapp Message/module.php	
+++ b/Whatsapp Message/module.php	
@@ -25,7 +25,7 @@ class WhatsappMessage extends IPSModule {
     * DWM_SendMessage($id);
     *
     */
-    public function SendMessage($topic,$recip, array $paramvals) {
+    public function SendMessage(string $recip, array $paramvals) {
         
             $token = $this->ReadPropertyString("WbToken");
             $appId = $this->ReadPropertyString("WbAppId");
@@ -55,7 +55,7 @@ class WhatsappMessage extends IPSModule {
                 "template" => [
                     "name" => $template,
                     "language" => [
-                        "code" => lang
+                        "code" => $lang
                     ],
                     "components" => [
                         [
diff --git a/library.json b/library.json
index 7e7c582..94d046c 100644
--- a/library.json
+++ b/library.json
@@ -8,6 +8,6 @@
         "date": 1491343200
     },
     "version": "1.0",
-    "build": 3,
+    "build": 4,
     "date": 0
 }
\ No newline at end of file