diff --git a/disciplines/computerscience.ttl b/disciplines/computerscience.ttl
index 775829da..aaba2b9c 100644
--- a/disciplines/computerscience.ttl
+++ b/disciplines/computerscience.ttl
@@ -87,10 +87,6 @@ rdf:JSON rdf:type rdfs:Datatype .
 #    Classes
 #################################################################
 
-###  http://org.semanticweb.owlapi/error#Error1
-<http://org.semanticweb.owlapi/error#Error1> rdf:type owl:Class .
-
-
 ###  https://w3id.org/emmo#EMMO_0266ec8c_bd13_4c9c_be77_607498793ed3
 :EMMO_0266ec8c_bd13_4c9c_be77_607498793ed3 rdf:type owl:Class ;
                                            owl:equivalentClass [ rdf:type owl:Restriction ;
@@ -317,8 +313,7 @@ https://www.computer.org/education/bodies-of-knowledge/software-engineering"""@e
 
 ###  https://w3id.org/emmo#EMMO_5c15f8c4_d2de_47a0_acdd_470b8dda979b
 :EMMO_5c15f8c4_d2de_47a0_acdd_470b8dda979b rdf:type owl:Class ;
-                                           rdfs:subClassOf <http://org.semanticweb.owlapi/error#Error1> ,
-                                                           :EMMO_70bbb94e_2ca7_4d73_ba01_6397f134d172 ,
+                                           rdfs:subClassOf :EMMO_70bbb94e_2ca7_4d73_ba01_6397f134d172 ,
                                                            :EMMO_c404e6d9_261d_4d2e_ab0d_ba4e05062647 ;
                                            skos:example "https://en.wiktionary.org/wiki/Ῥόδος"^^xsd:anyURI ;
                                            skos:prefLabel "IRI"@en ;