[Wikidata] Problematic SPARQL-FED Query

Hi Everyone, Does anyone know why the SPARQL-FED query at: http://tinyurl.com/ycc2tkp3, is failing? Query Text: PREFIX wd: <http://www.wikidata.org/entity/> PREFIX wdt: <http://www.wikidata.org/prop/direct/> PREFIX wikibase: <http://wikiba.se/ontology#> PREFIX schema: <http://schema.org/> PREFIX bd: <http://www.bigdata.com/rdf#> PREFIX psn: <http://www.wikidata.org/prop/statement/value-normalized/> PREFIX pq: <http://www.wikidata.org/prop/qualifier/> PREFIX dbo: <http://dbpedia.org/ontology/> PREFIX dct: <http://purl.org/dc/terms/> SELECT ?item ?dbpediaID  ?label ?subjectName ?prominence ?image WHERE {      {         SELECT ?item ?itemLabel ?coord ?prominence ?layer ?image         WHERE {                   ?item wdt:P31 wd:Q8502. # a mountain                   ?item wdt:P625 ?coord.                   ?item wdt:P17 wd:Q39. # in Switzerland                   ?item wdt:P2660 ?prominence .                   BIND(                     IF(?prominence < 1000, "<1000 metres",                     IF(?prominence < 2000, "1000 - 2000 metres",                     IF(?prominence < 3000, "2000 - 3000 metres",                     IF(?prominence < 4000, "3000 - 4000 metres",                     "> 4000 metres"))))                     AS ?layer).                   OPTIONAL {?item wdt:P18 ?image.}                   SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }             }                     LIMIT 200 }             SERVICE <http://dbpedia.org/sparql>          {             SELECT DISTINCT ?dbpediaID ?name ?label ?subjectName             WHERE {                     ?dbpediaID owl:sameAs ?item ;                     rdfs:label ?label ;                     dct:subject ?subject.                     FILTER (LANG(?label) = "en")                                         ?subject rdfs:label ?subjectName .                                       }           }      }     -- Regards, Kingsley Idehen Founder & CEO OpenLink Software (Home Page: http://www.openlinksw.com) Weblogs (Blogs): Legacy Blog: http://www.openlinksw.com/blog/~kidehen/ Blogspot Blog: http://kidehen.blogspot.com Medium Blog: https://medium.com/@kidehen Profile Pages: Pinterest: https://www.pinterest.com/kidehen/ Quora: https://www.quora.com/profile/Kingsley-Uyi-Idehen Twitter: https://twitter.com/kidehen Google+: https://plus.google.com/+KingsleyIdehen/about LinkedIn: http://www.linkedin.com/in/kidehen Web Identities (WebID): Personal: http://kingsley.idehen.net/public_home/kidehen/profile.ttl#i : http://id.myopenlink.net/DAV/home/KingsleyUyiIdehen/Public/kingsley.ttl#this