bject represents an exception from the
runtime system. It has the following fields.</P><UL CLASS="itemize"><LI CLASS="li-itemize">
<CODE>position</CODE>: a string representing the location where the
exception was raised.
</LI><LI CLASS="li-itemize"><CODE>message</CODE>: a string containing the exception message.
</LI></UL><H3 CLASS="subsection"><A NAME="htoc356">12.1.21</A>&#XA0;&#XA0;UnbuildableException</H3><P><A NAME="obj:UnbuildableException"></A><A NAME="object:UnbuildableException"></A><A NAME="@defau