Errors going from 3.5.2 -> 3.6.0a

After upgrading, I am unable to login to my openfire server…

Error.log shows:

2008.11.04 18:49:42 [org.jivesoftware.openfire.user.UserManager.initProvider(UserManager.java:456)] Error loading user provider: org.jivesoft.openfire.user.HybridUserProvider
java.lang.ClassNotFoundException: org.jivesoft.openfire.user.HybridUserProvider

2008.11.04 18:49:42 [org.jivesoftware.openfire.auth.AuthFactory.initProvider(AuthFactory.java:87)] Error loading auth provider: org.jivesoft.openfire.user.HybridAuthProvider
java.lang.ClassNotFoundException: org.jivesoft.openfire.user.HybridAuthProvider

2008.11.04 18:49:48 [org.jivesoftware.openfire.container.PluginManager.loadPlugin(PluginManager.jav a:419)] packetfilter - Database update failed. Please manually upgrade your database.
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Any thoughts on where I can start?

Thanks,

John