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Error using gateway.jar

after i upload gateway.jar in the plugin tab and restart Openfire, there is some error:

2009.02.13 16:21:04 [org.jivesoftware.util.log.util.CommonsLogFactory$1.error(CommonsLogFactory.jav a:88)
] Creator: ‘NewCreator[ConfigManager]’ for ConfigManager.js is returning null for type queries.
2009.02.13 16:21:04 [org.jivesoftware.util.log.util.CommonsLogFactory$1.error(CommonsLogFactory.jav a:88)
] Creator: ‘NewCreator[ConnectionTester]’ for ConnectionTester.js is returning null for type queries.

and also impossible to register in the gateway tab. the error page is shown in the attachment.

Very appreciate for your help.