added serial number

diff --git a/src/org/mxchange/addressbook/exceptions/AddressbookNameAlreadyUsedException.java b/src/org/mxchange/addressbook/exceptions/AddressbookNameAlreadyUsedException.java
index ec3f2dc2ae4dde22e4dc678f984b4d8d3be38a48..1fc11c62037f145493590a64073ecc849a0ecdd6 100644 (file)
--- a/src/org/mxchange/addressbook/exceptions/AddressbookNameAlreadyUsedException.java
+++ b/src/org/mxchange/addressbook/exceptions/AddressbookNameAlreadyUsedException.java
@@ -26,6 +26,11 @@ import org.mxchange.addressbook.model.addressbook.Addressbook;
  */
 public class AddressbookNameAlreadyUsedException extends Exception {
 
+       /**
+        * Serial number
+        */
+       private static final long serialVersionUID = 58_169_748_928_767_381L;
+
        /**
         * Constructor with address book instance
         * <p>