some little problem on binding SDK.......need help

i try to bind this jar SDK. and my meta.xml is here

<metadata>
<remove-node path="/api/package[@name='vpadn']/class[@name='J']/field[@name='j']" />
<attr path="/api/package[@name='vpadn']/class[@name='VpadnAdRequest']" name="visibility">public</attr>
<attr path="/api/package[@name='vpadn']/class[@name='VpadnAdRequest.VpadnErrorCode']" name="visibility">public</attr>
</metadata>

but it dun work......... seems VpadnErrorCode not found on C#. somebody can help me ?