Today I had the same problem.
To avoid this exception you have to add to your web.xml
following lines:
<context-param>
| <param-name>org.jboss.jbossfaces.WAR_BUNDLES_JSF_IMPL</param-name>
| <param-value>true</param-value>
| </context-param>
This will disable the built-in jsf implementation (just read server output)
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