Exception on Ontocat `index creation :

 * Exception in thread "main" java.lang.!NoClassDefFoundError: org/semanticweb/owl/model/OWLOntologyCreationException
   * uses the OWL API for reading ontologies.  This error suggests  that lib/pellet/owlapi/owlapi-api.jar is not on your classpath.
   * http://protege-ontology-editor-knowledge-acquisition-system.136.n4.nabble.com/Setting-up-OWL-API-protege-4-1-for-eclipse-td2017995.html
   *