diff --git a/YACOSCore/ejbModule/org/yacos/core/conferences/Conference.java b/YACOSCore/ejbModule/org/yacos/core/conferences/Conference.java
index 9aa3402..be62c0b 100644
--- a/YACOSCore/ejbModule/org/yacos/core/conferences/Conference.java
+++ b/YACOSCore/ejbModule/org/yacos/core/conferences/Conference.java
@@ -19,6 +19,10 @@ import org.yacos.core.users.User;
 
 @Entity
 public class Conference implements Serializable{
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 1L;
 	@Id
 	@GeneratedValue(strategy=GenerationType.AUTO)
 	private Integer id;