[Simple-support] Error reading overridden interface type

[Frank C. <fra...@gm...>]

IValidator.java
===========
public interface IValidator
{

}

MyValidator.java
============
@Root
public class MyValidator implements IValidator, Serializable
{
 @Element(name="model-class",required=true)
 private String clazzName;

 @Element(required=false)
 private String description
}

Item.java
=======
@Root(name="item")
public class Item
{
 @Entity(name="validate")
  private IValidator ivalidator;
}

test.xml
======
<item>
   <validate class="MyValidator">
       <model-class>xxx.yyy.zzz</model-class>
   </validate>
</item>

While I've omitted other attributes and entities, here is the top portion of
the exception I get:

org.simpleframework.xml.transform.TransformException: Transform of interface
org.fvjc.wd.validator.IValidator not supported
    at org.simpleframework.xml.transform.PackageMatcher.match(
PackageMatcher.java:91)
    at org.simpleframework.xml.transform.DefaultMatcher.matchType(
DefaultMatcher.java:111)
    at org.simpleframework.xml.transform.DefaultMatcher.match(
DefaultMatcher.java:90)
    at org.simpleframework.xml.transform.Transformer.read(Transformer.java
:106)
    at org.simpleframework.xml.load.PrimitiveFactory.getInstance(
PrimitiveFactory.java:104)
    at org.simpleframework.xml.load.Primitive.readTemplate(Primitive.java
:196)
    at org.simpleframework.xml.load.Primitive.readTemplate(Primitive.java
:178)
    at org.simpleframework.xml.load.Primitive.readElement(Primitive.java
:150)
    at org.simpleframework.xml.load.Primitive.readElement(Primitive.java
:133)

Any help would be appreciated