    org.hl7.fhir.exceptions.DefinitionException: Found slices with no slicing details at Extension.extension
    	at org.hl7.fhir.r5.utils.DefinitionNavigator.loadChildren(DefinitionNavigator.java:189)
    	at org.hl7.fhir.r5.utils.DefinitionNavigator.children(DefinitionNavigator.java:164)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compareDiffChildren(StructureDefinitionComparer.java:570)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compareDiff(StructureDefinitionComparer.java:475)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compare(StructureDefinitionComparer.java:179)
    	at org.hl7.fhir.r5.comparison.ComparisonSession.compare(ComparisonSession.java:107)
    	at org.hl7.fhir.igtools.publisher.comparators.PreviousVersionComparator.finishChecks(PreviousVersionComparator.java:262)
    	at org.hl7.fhir.igtools.publisher.Publisher.checkConformanceResources(Publisher.java:6586)
    	at org.hl7.fhir.igtools.publisher.Publisher.loadConformance2(Publisher.java:6392)
    	at org.hl7.fhir.igtools.publisher.Publisher.createIg(Publisher.java:1208)
    	at org.hl7.fhir.igtools.publisher.Publisher.execute(Publisher.java:1067)
    	at org.hl7.fhir.igtools.publisher.Publisher.main(Publisher.java:15577)
    	at org.hl7.fhir.igtools.web.PublicationProcess.runBuild(PublicationProcess.java:1080)
    	at org.hl7.fhir.igtools.web.PublicationProcess.doPublish(PublicationProcess.java:556)
    	at org.hl7.fhir.igtools.web.PublicationProcess.publishInner2(PublicationProcess.java:469)
    	at org.hl7.fhir.igtools.web.PublicationProcess.publishInner(PublicationProcess.java:286)
    	at org.hl7.fhir.igtools.web.PublicationProcess.publish(PublicationProcess.java:146)
    	at org.hl7.fhir.igtools.publisher.Publisher.main(Publisher.java:15325)