diff --git a/notus/Notus_Persistence/Stub.cs b/notus/Notus_Persistence/Stub.cs
index c00b816..36d4675 100644
--- a/notus/Notus_Persistence/Stub.cs
+++ b/notus/Notus_Persistence/Stub.cs
@@ -12,22 +12,22 @@ namespace Notus_Persistance
     {
         public static void SaveDatabaseData(Database database)
         {
-            
+            throw new NotImplementedException();
         }
 
         public static Database LoadDatabaseData()
         {
-            
+            throw new NotImplementedException();
         }
 
         public static void SaveUserData(User user)
         {
-            
+            throw new NotImplementedException();
         }
 
         public static User LoadUserData()
         {
-            
+            throw new NotImplementedException();
         }
     }
 }
diff --git a/notus/Notus_Persistence/ToXML.cs b/notus/Notus_Persistence/ToXML.cs
index f813109..57f7900 100644
--- a/notus/Notus_Persistence/ToXML.cs
+++ b/notus/Notus_Persistence/ToXML.cs
@@ -17,22 +17,22 @@ namespace Notus_Persistance
 
         public static void SaveDatabaseData(Database database)
         {
-
+            throw new NotImplementedException();
         }
 
         public static Database LoadDatabaseData()
         {
-
+            throw new NotImplementedException();
         }
 
         public static void SaveUserData(User user)
         {
-
+            throw new NotImplementedException();
         }
 
         public static User LoadUserData()
         {
-
+            throw new NotImplementedException();
         }
     }
 }