Unable to add new user to roster (openfire 3.5.1)

After installing openfire 3.5.1 i am unable to add  users through spark to my roster. Search lists the users i want to add but when i right click on spark search results and try to add user, spark disconnects from open fire server. Spark logs give this:

SEVERE: Unable to add new entry jonathan@gkptech

No response from the server.:

    at org.jivesoftware.smack.Roster.createEntry(Roster.java:249)

    at org.jivesoftware.spark.ui.RosterDialog.addEntry(RosterDialog.java:473)

    at org.jivesoftware.spark.ui.RosterDialog$4.construct(RosterDialog.java:438)

    at org.jivesoftware.spark.util.SwingWorker$2.run(SwingWorker.java:129)

    at java.lang.Thread.run(Unknown Source)

Anyone else encountered this with latest openfire release.