How do I implement a simple phase listener in Seam?

Issue

• How to implement a simple phase listener in Seam

• Having problems registering a simple phase listener class in faces-config.xml as I get the following errors during application startup/redeploy

  ERROR [[/seam_webapp]] Exception sending context initialized event to listener instance of class org.jboss.web
  .jsf.integration.config.JBossJSFConfigureListener
  com.sun.faces.config.ConfigurationException: CONFIGURATION FAILED! 
    Source Document: jndi:/localhost/seam_cms/WEB-INF/faces-config.xml
    Cause: Unable to find class 'com.domain.company.listeners.CustomPhaseListener'
       at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:215)
       at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:196)
       at org.jboss.web.jsf.integration.config.JBossJSFConfigureListener.contextInitialized(JBossJSFConfigureListener.java:60)