When I try to bind an entitymanager using this:

<core:entity-manager-factory name="omegaFactory"/>

 <core:managed-persistence-context name="em"
 entity-manager-factory="omegaFactory"
 auto-create="true"/>

Mar 8, 2007 11:56:47 AM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class org.jboss.seam.servlet.SeamListener
java.lang.IllegalArgumentException: No converter for type: org.jboss.seam.core.Expressions$ValueBinding
 at org.jboss.seam.util.Conversions.getConverter(Conversions.java:55)
 at org.jboss.seam.Component$ConstantInitialValue.<init>(Component.java:1998)
 at org.jboss.seam.Component.getInitialValue(Component.java:422)
 at org.jboss.seam.Component.getTopInitialValue(Component.java:402)
 at org.jboss.seam.Component.initInitializers(Component.java:380)
 at org.jboss.seam.Component.<init>(Component.java:265)
 at org.jboss.seam.Component.<init>(Component.java:206)
 at org.jboss.seam.init.Initialization.addComponent(Initialization.java:760)
 at org.jboss.seam.init.Initialization.addComponents(Initialization.java:677)
 at org.jboss.seam.init.Initialization.init(Initialization.java:425)
 at org.jboss.seam.servlet.SeamListener.contextInitialized(SeamListener.java:33)
 at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3827)
 at org.apache.catalina.core.StandardContext.start(StandardContext.java:4336)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1015)
 at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1015)
 at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
 at org.apache.catalina.core.StandardService.start(StandardService.java:448)
 at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
 at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
 at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)