Error on submit form

Hello at all, I'm Micael Gallego. I'm working with JavaXPCOM embedding
Mozilla in a Java application.

My program load a webpage in Mozilla and then manipulate DOM of the
loaded page. I have an error when I try to submit a Form. When I
execute a JavaScript code from JavaXPCOM it works fine, but equivalent
Java version to submit form fails. I'm using XulRunner 1.8.0.4, any
ideas????

I have the following error:
Exception in thread "main" org.mozilla.xpcom.XPCOMException: The
function "submit" returned an error condition  (0x80040111)
	at org.mozilla.xpcom.internal.XPCOMJavaProxy.callXPCOMMethod(Native
Method)
	at
org.mozilla.xpcom.internal.XPCOMJavaProxy.invoke(XPCOMJavaProxy.java:140)
	at $Proxy17.submit(Unknown Source)
	at
org.mozilla.dom.html.HTMLFormElementImpl.submit(HTMLFormElementImpl.java:122)
	at TestFormSubmit.main(TestFormSubmit.java:26)

I'm using the code of Eclipse ATF project as base of browser.

Thanks for your time