JSF navigate into folder issue. Not Found in ExternalContext as a Resource

JSF navigate into folder issue. Not Found in ExternalContext as a Resource

I'm a jee newbie. I'm developing a web application with jee7 and I would
organize my .xhtml files into different folder. I tried to set web.xml and
faces-config.xml files but when I click on a button to enter in a folder I
have this issue,
com.sun.faces.context.FacesFileNotFoundException:
/protected-area/index.xhtml Not Found in ExternalContext as a Resource
Problem appear when I want enter in both folder, "protected-area" and
"public". I hope I was clear, I don't understand because it doesn't work.
Many thanks for your help.
These are my files.
index.xhtml
<h:head>
<title>jingsen</title>
</h:head>
<h:body>
Select where you want to go:
<h:form>
<h:commandButton value="protected area"
action="protected-area"></h:commandButton>
<h:commandButton value="public" action="public"></h:commandButton>
<h:commandButton value="testtest" action="test"></h:commandButton>
</h:form>
</h:body>
web.xml
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<context-param>
<param-name>javax.faces.CONFIG_FILES</param-name>
<param-value>/WEB-INF/faces-config.xml</param-value>
</context-param>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.xhtml</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>index.xhtml</welcome-file>
</welcome-file-list>
<login-config>
<auth-method>FORM</auth-method>
<realm-name>jingsen-realm</realm-name>
<form-login-config>
<form-login-page>/login.xhtml</form-login-page>
<form-error-page>/error.xhtml</form-error-page>
</form-login-config>
</login-config>
<security-constraint>
<display-name>Admin Pages</display-name>
<web-resource-collection>
<web-resource-name>Protected Area</web-resource-name>
<description/>
<url-pattern>/protected-area/*</url-pattern>
</web-resource-collection>
<auth-constraint>
<description/>
<role-name>admin</role-name>
<role-name>cassa</role-name>
<role-name>cameriere</role-name>
<role-name>cucina</role-name>
<role-name>bar</role-name>
</auth-constraint>
</security-constraint>
<security-role>
<role-name>admin</role-name>
</security-role>
<security-role>
<role-name>cameriere</role-name>
</security-role>
<security-role>
<role-name>cucina</role-name>
</security-role>
<security-role>
<role-name>bar</role-name>
</security-role>
faces-config.xml
<navigation-rule>
<from-view-id>index.xhtml</from-view-id>
<navigation-case>
<from-outcome>protected-area</from-outcome>
<to-view-id>/protected-area/index.xhtml</to-view-id>
<redirect/>
</navigation-case>
<navigation-case>
<from-outcome>public</from-outcome>
<to-view-id>/public/index.xhtml</to-view-id>
<redirect/>
</navigation-case>
<navigation-case>
<from-outcome>test</from-outcome>
<to-view-id>prova.xhtml</to-view-id>
<redirect/>
</navigation-case>
</navigation-rule>