Shibboleth Developers

The configuration snippet in sp.xml present below:

<SessionInitiator Location="/WAYF" id="ME" isDefault="true" 
wayfBinding="urn:mace:shibboleth:1.0:profiles:AuthnRequest"
                                
Binding="urn:mace:shibboleth:sp:1.3:SessionInit" 
wayfURL="https://wayf.example.org/shibboleth-wayf/WAYF";>
                        </SessionInitiator>

                        <!-- This example directs users to a specific 
federation's WAYF service. -->
                        <SessionInitiator id="IQ"
                                Location="/WAYF/InQueue"
                                
Binding="urn:mace:shibboleth:sp:1.3:SessionInit"
                                
wayfURL="https://wayf.internet2.edu/InQueue/WAYF";
                                
wayfBinding="urn:mace:shibboleth:1.0:profiles:AuthnRequest" />

The file wayfconfig.xml like this

<?xml version="1.0"?>
<WayfConfig 
        xmlns="urn:mace:shibboleth:wayf:config:1.0" 
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; >

        <Default 
            handleCookie="NeverFollow"
            jspFile="/wayf.jsp"
            errorJspFile="/wayferror.jsp"
            provideList="true"
            provideListOfList="true"
            showUnusableIdPs="false"
            cacheExpiration="604800" >
            <SearchIgnore>
                <IgnoreText>Institution</IgnoreText>
                <IgnoreText>University</IgnoreText>
                <IgnoreText>State </IgnoreText>
                <IgnoreText>School</IgnoreText>
            </SearchIgnore>
        </Default>

        <MetadataProvider 
                displayName="Put in User Friendly Name here"
                identifier="FirstSite"
                
type="edu.internet2.middleware.shibboleth.metadata.provider.XMLMetadata"
                
uri="file:/c:/tomcat/webapps/shibboleth-wayf/WEB-INF/classes/conf/sites.xml"/>


    <DiscoveryServiceHandler
        location=".+/WAYF" 
        default="true" />
        
    <DiscoveryServiceHandler
        location=".+/ClearCache.wayf"
        handleCookie="ClearCookie" />

</WayfConfig>

The file sites.xml like this

<SiteGroup Name="urn:mace:inqueue" xmlns="urn:mace:shibboleth:1.0" 
xmlns:ds="http://www.w3.org/2000/09/xmldsig#"; 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; 
xsi:schemaLocation="urn:mace:shibboleth:1.0 ../schemas/shibboleth.xsd">
        <OriginSite Name="urn:mace:inqueue:shibdev.edu">
                <Alias>Shibboleth Development Origin</Alias>
                <Contact Type="technical" Name="Scott Cantor" 
Email=""/>
                <HandleService 
Location="https://shib2.internet2.edu/shibboleth/HS"; 
Name="shib2.internet2.edu"/>
                <AttributeAuthority 
Location="https://shib2.internet2.edu/shibboleth/AA"; 
Name="shib2.internet2.edu"/>
                <Domain>shibdev.edu</Domain>
        </OriginSite>   
</SiteGroup>

When I access any secure resource protected by SP,SP redirect the resource's 
url to WAYF service,it then response a page to let me select IdP,but the
IdP list is empty.Some character of the result  is :

The Service you are trying to reach requires that you authenticate with your 
home institution, please select it from the list below. 

Choose from a list: 
<empty,why????>
Federation  Institution 
xxxx <select list>


Thanks