diff --git a/YACOSCore/ejbModule/org/yacos/core/exceptions/PKAlreadyUsedException.java b/YACOSCore/ejbModule/org/yacos/core/exceptions/PKAlreadyUsedException.java
new file mode 100644
index 0000000..949dc0a
--- /dev/null
+++ b/YACOSCore/ejbModule/org/yacos/core/exceptions/PKAlreadyUsedException.java
@@ -0,0 +1,8 @@
+package org.yacos.core.exceptions;
+
+public class PKAlreadyUsedException extends Exception{
+
+	
+	private static final long serialVersionUID = 1L;
+
+}