Graph visualization

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Internal error

Exception: HTTP error for SPARQL query: PREFIX rdf: PREFIX rdfs: SELECT ?s ?p ?o ?count WHERE { {SELECT DISTINCT ?s (rdfs:subClassOf AS ?p) ?o (-1 AS ?count) WHERE { rdf:type ?c . ?c rdfs:subClassOf* ?s . ?s rdfs:subClassOf ?o . }} UNION {SELECT ?s ?p (SAMPLE(?o) AS ?o) (COUNT(?o) AS ?count) WHERE { BIND( AS ?s) ?s ?p ?o . FILTER(?p != rdf:type) FILTER(?p != rdfs:subClassOf) } GROUP BY ?s ?p } UNION {SELECT DISTINCT ?s (rdfs:subClassOf AS ?p) ?o (-2 AS ?count) WHERE { rdfs:subClassOf+ ?s . ?s rdfs:subClassOf ?o . }} } in /home/yago/website/content/graph.php:22 Stack trace: #0 /home/yago/website/content/graph.php(162): getSparqlQueryXmlDocument('PREFIX rdf: