Shibboleth Developers

I'm using the 2.0 SP and 2.0 IdP....

the SP sends this AuthnRequest:

<samlp:AuthnRequest 
xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol" 
AssertionConsumerServiceIndex="1" 
Destination="https://stc-test11.cis.brown.edu/idp/profile/saml2/Redirect/SSO"; 
ID="_27602a12eb4b52a607963a0b5008bf91" 
IssueInstant="2007-12-03T18:13:39Z" Version="2.0"><saml:Issuer 
xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">https://stc-test11.cis.brown.edu/Shibboleth.sso/Metadata</saml:Issuer><samlp:NameIDPolicy 
AllowCreate="1"/></samlp:AuthnRequest>

and I get this error:

> Attribute transientId was not encoded because no 
> SAML2AttributeEncoder was attached to it
> No principal attribute supported encoding into a supported name ID format.

I have this definition in my resolver file:

    <!-- Name Identifier related attributes -->
    <resolver:AttributeDefinition id="transientId" 
xsi:type="TransientId" xmlns="urn:mace:shibboleth:2.0:resolver:ad">
        <resolver:AttributeEncoder xsi:type="SAML1StringNameIdentifier"
            xmlns="urn:mace:shibboleth:2.0:attribute:encoder" 
nameFormat="urn:mace:shibboleth:1.0:nameIdentifier" />

        <resolver:AttributeEncoder xsi:type="SAML2StringNameID" 
xmlns="urn:mace:shibboleth:2.0:attribute:encoder"
            nameFormat="urn:oasis:names:tc:SAML:2.0:nameid-format:transient" 
/>
    </resolver:AttributeDefinition>

and this in my filter file (this comes in the  distributed file):

    <!--  Release the transient ID to anyone -->
    <AttributeFilterPolicy id="releaseTransientIdToAnyone">
        <PolicyRequirementRule xsi:type="basic:ANY" />

        <AttributeRule attributeID="transientId">
            <PermitValueRule xsi:type="basic:ANY" />
        </AttributeRule>

    </AttributeFilterPolicy>

suggestions?