From your log, it seemed that you are using MyFaces as JSF
implementation. Seam 1.2.1 requires JSF RI instead of MyFaces. However, JBoss AS 4.0.5 has
MyFaces JARs by default.
So, you will need to either remove the MyFaces JARs and add in JSF RI JARs to your server,
or upgrade to JBoss AS 4.2.0.
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