EmptyStackExceptionError

[david . schwartz]

I'm using xalan J 2.5.2 with JDK 1.3
While processing an xsl file with a Java extension I'm getting this error...

 Line #29; Column #36; XSLT Error (javax.xml.transform.TransformerException): java.util.EmptyStackException

It occurs when there is more than one matching node in the xml file. i.e., if I have only one matching node there is no error & the xsl is procesed as expected.

any ideas?