Problemas com .properties no Struts

Olá, eu estou na parte de Struts da Apostila FJ21 da Caelum, estou seguindo os exemplos direitinho. Quando rodo um arquivo jsp qualquer, funciona beleza, mas quando rodo o exemplo da apostila esta dando esse erro, já repetir os passos mais de 20 vezes e nada de "funfar".

ERRO:

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /testa-mensagens.jsp at line 4

1: <%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%>
2: <html>
3: <head>
4: <title><bean:message key="site.titulo"/></title>
5: </head>
6: <body>
7: 	<bean:message key="menu.nome"/><br/>

Stacktrace:
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:398)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

javax.servlet.ServletException: javax.servlet.jsp.JspException: Missing message for key "site.titulo" in bundle "(default bundle)" for locale pt_BR
	org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:852)
	org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:781)
	org.apache.jsp.testa_002dmensagens_jsp._jspService(testa_002dmensagens_jsp.java:89)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

javax.servlet.jsp.JspException: Missing message for key "site.titulo" in bundle "(default bundle)" for locale pt_BR
	org.apache.struts.taglib.bean.MessageTag.doStartTag(MessageTag.java:233)
	org.apache.jsp.testa_002dmensagens_jsp._jspx_meth_bean_005fmessage_005f0(testa_002dmensagens_jsp.java:106)
	org.apache.jsp.testa_002dmensagens_jsp._jspService(testa_002dmensagens_jsp.java:61)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

meu MessageResources

#   Licensed to the Apache Software Foundation (ASF) under one or more
#   contributor license agreements.  See the NOTICE file distributed with
#   this work for additional information regarding copyright ownership.
#   The ASF licenses this file to You under the Apache License, Version 2.0
#   (the "License"); you may not use this file except in compliance with
#   the License.  You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.

# -- standard errors --
errors.header=<UL>
errors.prefix=<LI>
errors.suffix=</LI>
errors.footer=</UL>
# -- validator --
errors.invalid={0} is invalid.
errors.maxlength={0} can not be greater than {1} characters.
errors.minlength={0} can not be less than {1} characters.
errors.range={0} is not in the range {1} through {2}.
errors.required={0} is required.
errors.byte={0} must be an byte.
errors.date={0} is not a date.
errors.double={0} must be an double.
errors.float={0} must be an float.
errors.integer={0} must be an integer.
errors.long={0} must be an long.
errors.short={0} must be an short.
errors.creditcard={0} is not a valid credit card number.
errors.email={0} is an invalid e-mail address.
# -- other --
errors.cancel=Operation cancelled.
errors.detail={0}
errors.general=The process did not complete. Details should follow.
errors.token=Request could not be completed. Operation is not in sequence.
# -- welcome --
welcome.title=Struts Blank Application
welcome.heading=Welcome!
welcome.message=To get started on your own application, copy the struts-blank.war to a new WAR file using the name for your application. Place it in your container's "webapp" folder (or equivalent), and let your container auto-deploy the application. Edit the skeleton configuration files as needed, restart your container, and you are on your way! (You can find the MessageResources.properties file with this message in the /WEB-INF/src folder.)
# -- comentário de um arquivo .properties
menu.nome=Nome do menu
menu.arquivo=Escolher arquivo
menu.editar=Editar Arquivo
menu.sair=Sair da aplicação
site.titulo=Sistema de teste do Struts

minha jsp

... alguém, por gentileza, poderia me ajudar por favor? Obrigado!

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