java.lang.IllegalArgumentException: not a proxy instance

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java.lang.IllegalArgumentException: not a proxy instance
at net.java.dev.jna.jna.ComObject.prepareArgs(ComObject.java:213)
at net.java.dev.jna.jna.ComObject.invokeVoidCom(ComObject.java:379)
at net.java.dev.jna.jna.ComObject.invoke(ComObject.java:637)
at com.sun.proxy.$Proxy4.AddFocusChangedEventHandler(Unknown Source)
at net.java.dev.jna.jna.test.othermethod(test.java:47)
at net.java.dev.jna.jna.test.main(test.java:12)

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