[HELP]Exception in ServerPagesGenerator.generate()

[LEBRETON Philippe]

I want include a String with a content XML in my XML and i used :
<util:include-expr><util:expr><xsp:expr>Car.toString()</xsp:expr></util:expr></util:include-expr>
Car is declared :
StringBuffer Car = new StringBuffer();
Car content :
<bdo>
<Pac>1</Pac>
<TP>1</TP>
</bdo>

Description:org.apache.cocoon.ProcessingException: Exception in ServerPagesGenerator.generate():

java.lang.RuntimeException: Could not include page Content is not allowed in prolog.
Help me.
Whereis the problem.
This expression work with Cocoon 2.0.2 and not with Cocoon 2.0.3
Thanks
Philippe LEBRETON
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