diff --git a/Admin/Uninstall.php b/Admin/Uninstall.php
index ac60b3c..66d6c96 100644
--- a/Admin/Uninstall.php
+++ b/Admin/Uninstall.php
@@ -17,6 +17,7 @@ namespace Modules\Billing\Admin;
 use phpOMS\DataStorage\Database\DatabasePool;
 use phpOMS\DataStorage\Database\Schema\Builder;
 use phpOMS\Module\UninstallAbstract;
+use phpOMS\Module\InfoManager;
 
 /**
  * Navigation class.
diff --git a/Admin/Update.php b/Admin/Update.php
index 08b1851..a15b288 100644
--- a/Admin/Update.php
+++ b/Admin/Update.php
@@ -17,6 +17,8 @@ namespace Modules\Billing\Admin;
 use phpOMS\DataStorage\Database\DatabasePool;
 use phpOMS\Module\UpdateAbstract;
 use phpOMS\System\File\Directory;
+use phpOMS\Module\InfoManager;
+
 
 /**
  * Navigation class.
@@ -33,7 +35,7 @@ class Update extends UpdateAbstract
     /**
      * {@inheritdoc}
      */
-    public static function update(DatabasePool $dbPool, array $info)
+    public static function update(DatabasePool $dbPool, InfoManager $info)
     {
         Directory::deletePath(__DIR__ . '/Update');
         mkdir('Update');
diff --git a/Models/Invoice.php b/Models/Invoice.php
index ac89838..8fd740e 100644
--- a/Models/Invoice.php
+++ b/Models/Invoice.php
@@ -514,4 +514,9 @@ class Invoice implements \JsonSerializable
     {
         $this->elements[] = $element;
     }
+
+    public function jsonSerialize()
+    {
+        
+    }
 }
\ No newline at end of file
diff --git a/Models/InvoiceElement.php b/Models/InvoiceElement.php
index a217c3f..7460bbb 100644
--- a/Models/InvoiceElement.php
+++ b/Models/InvoiceElement.php
@@ -273,4 +273,9 @@ class InvoiceElement implements \JsonSerializable
     {
         return $this->totalPriceGross;
     }
+
+    public function jsonSerialize()
+    {
+        
+    }
 }
\ No newline at end of file