Quip Api problems

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I’m trying everything to make Quip Api works… But in my all tries i get the follow message:

XQueryException: null

What can i do?

My code is the follow above (servlet running in a non Quip path):

Object obj = null;
obj = new Properties();
StringBuffer stringbuffer1 = null;
stringbuffer1 = new StringBuffer();
StringBuffer stringbuffer2 = null;
stringbuffer2 = new StringBuffer();

try {
stringbuffer1.append( “file://” );
stringbuffer1.append( “.” );
((Hashtable) obj).put( “version”, “syntax01” );
((Hashtable) obj).put( “home”, “C:\” );
((Hashtable) obj).put( “quipcmd”, “C:\Arquiv~1\Quip\Quip.exe” );
Connection Conexao = DriverManager.getConnection( stringbuffer1.toString(), (Properties) obj );
out.println(“FOR $t IN document("agenda.xml")//clientes " +
“WHERE contains($t/nome/text(),"” + req.getParameter(“nome”) +”") "+
“RETURN /e_mail/text()”);

QueryResult Resultado = Conexao.executeQuery(“FOR $t IN document("agenda.xml")//clientes " +
“WHERE contains($t/nome/text(),"” + req.getParameter(“nome”) +”") "+
“RETURN $t/e_mail/text()”);
out.println(Resultado);
}
catch (XQueryException XQEx) {
out.println("XQueryException: " + XQEx.getMessage());
}
}