Spark source missing key menuitem.chatframe.option?

I run the Startup.class ,after Loginin, I got these errors,I didnt find the keys in

org.jivesoftware.resource’s directory.Could somebody tell me what I missed?

java.util.MissingResourceException: Can’t find resource for bundle java.util.PropertyResourceBundle, key **menuitem.chatframe.option
**at java.util.ResourceBundle.getObject(ResourceBundle.java:386)
at java.util.ResourceBundle.getObject(ResourceBundle.java:383)
at java.util.ResourceBundle.getString(ResourceBundle.java:346)
at org.jivesoftware.resource.Res.getString(Unknown Source)
at org.jivesoftware.spark.ui.ChatFrame.(Unknown Source)
at org.jivesoftware.MainWindow.(Unknown Source)
at org.jivesoftware.MainWindow.getInstance(Unknown Source)
at org.jivesoftware.LoginDialog.startSpark(Unknown Source)
at org.jivesoftware.LoginDialog.access$3(Unknown Source)
at org.jivesoftware.LoginDialog$LoginPanel$1.construct(Unknown Source)
at org.jivesoftware.spark.util.SwingWorker$2.run(Unknown Source)
at java.lang.Thread.run(Thread.java:619)

消息编辑者为:xulate