With
<seam.version>3.0.0.CR1</seam.version>
I got ERROR log message
org.jboss.seam.config.xml.util.XmlConfigurationException: Wrong root namespace for XML config file, expected:urn:java:ee or http://java.sun.com/xml/ns/javaee found: at vfs:/E:/work/prgs/jboss-6.1.0-SNAPSHOT/server/default/deploy/....war/WEB-INF/lib/seam-conversation-spi-3.0.0.Beta1.jar/META-INF/beans.xml:19
Workaround: Add namespace in empty seam-conversation-spi-3.0.0.Beta1.jar/META-INF/beans.xml
<beans xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://docs.jboss.org/cdi/beans_1_0.xsd"> </beans>
Seems like a bug. You should raise an issue here.