The value is invalid according to its datatype

The value is invalid according to its datatype

This has been eluding me all day. First, here is the config section:
<system.serviceModel>
<services>
<service name="Namespace.FooService"
behaviorConfiguration="Namespace.FooBehavior">
<endpoint address="" binding="basicHttpBinding"
contract="Namespace.IFooService" />
<endpoint address="mex" binding="mexHttpBinding"
contract="IMetadataExchange" />
<host>
<baseAddresses>
<add baseAddress="http://localhost:80/FooServices" />
</baseAddresses>
</host>
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="Namespace.FooBehavior">
<serviceMetadata httpsGetEnabled="true" httpGetEnabled="true" />
</behavior>
</serviceBehaviors>
</behaviors>
</system.serviceModel>
The contract:
[ServiceContract(Namespace="https://Example.com/Foo")]
public interface IPrintDriverService
...
public class FooService: IFooService
which is giving me the warnings:
WCF configuration validation warning: The 'contract' attribute is invalid
- The value 'Namespace.IFooService' is invalid according to its datatype
'serviceContractType'.
WCF configuration validation warning: The 'name' attribute is invalid -
The value 'Namespace.FooService' is invalid according to its datatype
'serviceNameType'.
Which I can't seem to get rid of. When I go to debug it in
WcfServiceHost.exe, the service runs fine. But, when I go to publish it
fails silently.
Is there a way to see why the publish failed?
Does anyone know how to get rid of those warnings?