diff --git a/notus/Biblioteque_de_Class/Exception.cs b/notus/Biblioteque_de_Class/Exception.cs
index 90f37a1..afc0489 100644
--- a/notus/Biblioteque_de_Class/Exception.cs
+++ b/notus/Biblioteque_de_Class/Exception.cs
@@ -1,7 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Runtime.Serialization;
+using System.Runtime.Serialization;
 using System.Text;
 using System.Threading.Tasks;
 
@@ -12,40 +12,54 @@ namespace Biblioteque_de_Class
     {
         public NotAllowedException(string message) : base(message)
         {
-
         }
         protected  NotAllowedException(SerializationInfo info, StreamingContext context) : base(info, context)
         {
-
         }
     }
-    public class AlreadyUsedException : Exception
+    [Serializable]
+    public class AlreadyUsedException : Exception, ISerializable
     {
         public AlreadyUsedException(string message) : base(message)
         {
         }
+        protected  AlreadyUsedException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+        }
     }
-    public class NotFoundException : Exception
+    [Serializable]
+    public class NotFoundException : Exception, ISerializable
     {
         public NotFoundException(string message) : base(message)
         {
         }
+        protected  NotFoundException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+        }
     }
-    public class AlreadyExistException : Exception
+    [Serializable]
+    public class AlreadyExistException : Exception, ISerializable
     {
         public AlreadyExistException(string message) : base(message)
         {
         }
+        protected  AlreadyExistException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+        }
     }
 
 
 
 
-
-    public class FileException : Exception
+    [Serializable]
+    public class FileException : Exception, ISerializable
     {
         public FileException(string message) : base(message)
         {
         }
+        protected  FileException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+
+        }
     }
 }