java.lang.NoClassDefFoundError: javax/faces/application/ProjectStage

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javax/faces/application/ProjectStage
java.lang.NoClassDefFoundError: javax/faces/application/ProjectStage
at com.ocpsoft.pretty.faces2.config.reload.JSF2DevelopmentModeDetector.isDevelopmentMode(JSF2DevelopmentModeDetector.java:44)
at org.ocpsoft.rewrite.prettyfaces.PrettyFacesRewriteLifecycleListener.beforeInboundLifecycle(PrettyFacesRewriteLifecycleListener.java:51)
at com.ocpsoft.pretty.faces.config.reload.PrettyConfigReloader.isDevelopmentModeActive(PrettyConfigReloader.java:129)
at org.ocpsoft.rewrite.prettyfaces.PrettyFacesRewriteLifecycleListener.beforeInboundLifecycle(PrettyFacesRewriteLifecycleListener.java:34)

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