XALAN Extension Problems

[kkumari]

I have a java extension function which takes a documentFragment as input.
This used to work fine with previous version of xalan. With xalan 2 it gives
the following err..
could not find method
static
com.classwell.util.CLGXalanExtensions.rtfToJavaScriptString([ExpressionCo
ntext,] #RTREEFRAG). --

why is this error? Is it a bug??