    org.hl7.fhir.exceptions.DefinitionException: Found slices with no slicing details at Observation.category
    	at org.hl7.fhir.r5.utils.DefinitionNavigator.loadChildren(DefinitionNavigator.java:213)
    	at org.hl7.fhir.r5.utils.DefinitionNavigator.children(DefinitionNavigator.java:170)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compareDiffChildren(StructureDefinitionComparer.java:573)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compareDiff(StructureDefinitionComparer.java:477)
    	at org.hl7.fhir.r5.comparison.StructureDefinitionComparer.compare(StructureDefinitionComparer.java:181)
    	at org.hl7.fhir.r5.comparison.ComparisonSession.compare(ComparisonSession.java:107)
    	at org.hl7.fhir.igtools.publisher.comparators.PreviousVersionComparator.finishChecks(PreviousVersionComparator.java:266)
    	at org.hl7.fhir.igtools.publisher.Publisher.checkConformanceResources(Publisher.java:6702)
    	at org.hl7.fhir.igtools.publisher.Publisher.loadConformance2(Publisher.java:6485)
    	at org.hl7.fhir.igtools.publisher.Publisher.createIg(Publisher.java:1168)
    	at org.hl7.fhir.igtools.publisher.Publisher.execute(Publisher.java:1023)
    	at org.hl7.fhir.igtools.publisher.Publisher.main(Publisher.java:15805)
    	at org.hl7.fhir.igtools.web.PublicationProcess.runBuild(PublicationProcess.java:1101)
    	at org.hl7.fhir.igtools.web.PublicationProcess.doPublish(PublicationProcess.java:557)
    	at org.hl7.fhir.igtools.web.PublicationProcess.publishInner2(PublicationProcess.java:470)
    	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:15553)