How To Get WebService Working

I am trying to setup a Spring.net web-service but keep getting an error message that I cannot figure out.

Error:
System.NotSupportedException: Target 'target' of type
'Spring.Objects.Factory.Support.RootWebObjectDefinition' does not support methods of 'StudentRegistration.Services.IBoundaryService'.
at Spring.Util.AssertUtils.Understands(Object target, String targetName, Type requiredType)
at HelloWorldExporter.GetAllBounds()

Code:
public interface IBoundaryService {
XmlDocument GetAllBounds(); }
public class BoundaryService :IBoundaryService {
public virtual IBoundaryDao BoundaryDao { get; set; }
public virtual XmlDocument GetAllBounds() {
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml("<test>ok</test>"); return xmlDoc; } }

Configuration:
<object name="BoundaryService" type="StudentRegistration.Services.BoundaryService, StudentRegistration" abstract="true"> </object>
<object id="BoundaryExporter" type="Spring.Web.Services.WebServiceExporter, Spring.Web">
<property name="TargetName" value="BoundaryService"/>
<property name="Namespace" value="http://fake/services"/>
<property name="Description" value="something"/>
<property name="MemberAttributes"> <dictionary> <entry key="GetAllBounds">
<object type="System.Web.Services.WebMethodAttribute, System.Web.Services">
<property name="Description" value="something."/>
<property name="MessageName" value="GetAllBounds"/>
</object> </entry> </dictionary> </property> </object>

What should I try to clear this up?