Unexpected non-MediaWiki exception encountered, of type "SMWSparqlDatabaseError"
exception 'SMWSparqlDatabaseError' with message 'A SPARQL query error has occurred
Query: PREFIX wiki: <http://enipedia.tudelft.nl/wiki/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX swivt: <http://semantic-mediawiki.org/swivt/1.0#>
PREFIX property: <http://enipedia.tudelft.nl/wiki/Property:>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
SELECT DISTINCT ?result WHERE {
?result property:Year-23aux ?v2 .
?result property:Is_availability_of wiki:Kenema_Powerplant .

}
ORDER BY ASC(?v2)
OFFSET 0
LIMIT 51
Error: Unkown error
Endpoint: http://enipedia.tudelft.nl/sparql
HTTP response code: 503
' in /usr/share/enipedia/extensions/SemanticMediaWiki/includes/sparql/SMW_SparqlDatabase.php:616
Stack trace:
#0 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/sparql/SMW_SparqlDatabase.php(480): SMWSparqlDatabase->throwSparqlErrors('http://enipedia...', 'PREFIX wiki: <h...')
#1 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/sparql/SMW_SparqlDatabase.php(260): SMWSparqlDatabase->doQuery('PREFIX wiki: <h...')
#2 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/storage/SMW_SparqlStoreQueryEngine.php(340): SMWSparqlDatabase->select('?result', '?result propert...', Array, Array)
#3 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/storage/SMW_SparqlStore.php(365): SMWSparqlStoreQueryEngine->getInstanceQueryResult(Object(SMWQuery))
#4 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/SMW_QueryProcessor.php(395): SMWSparqlStore->getQueryResult(Object(SMWQuery))
#5 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/SMW_QueryProcessor.php(361): SMWQueryProcessor::getResultFromQuery(Object(SMWQuery), Array, Array, 2, 1, 'table')
#6 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/SMW_QueryProcessor.php(339): SMWQueryProcessor::getResultFromQueryString('[[Is availabili...', Array, Array, 2, 1)
#7 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/parserhooks/SMW_Ask.php(34): SMWQueryProcessor::getResultFromFunctionParams(Array, 2)
#8 [internal function]: SMWAsk::render(Object(Parser), '[[Is availabili...', 'mainlabel=-', '?Percent', '?Year', 'sort=Year', 'order=ascending')
#9 /usr/share/enipedia/includes/parser/Parser.php(3189): call_user_func_array(Array, Array)
#10 /usr/share/enipedia/includes/parser/Preprocessor_DOM.php(1043): Parser->braceSubstitution(Array, Object(PPTemplateFrame_DOM))
#11 /usr/share/enipedia/includes/parser/Parser.php(3344): PPFrame_DOM->expand(Object(PPNode_DOM))
#12 /usr/share/enipedia/includes/parser/Preprocessor_DOM.php(1043): Parser->braceSubstitution(Array, Object(PPTemplateFrame_DOM))
#13 /usr/share/enipedia/includes/parser/Parser.php(3349): PPFrame_DOM->expand(Object(PPNode_DOM))
#14 /usr/share/enipedia/includes/parser/Preprocessor_DOM.php(1043): Parser->braceSubstitution(Array, Object(PPFrame_DOM))
#15 /usr/share/enipedia/includes/parser/Parser.php(2978): PPFrame_DOM->expand(Object(PPNode_DOM), 0)
#16 /usr/share/enipedia/includes/parser/Parser.php(1094): Parser->replaceVariables('{{PowerplantTes...')
#17 /usr/share/enipedia/includes/parser/Parser.php(345): Parser->internalParse('{{PowerplantTes...')
#18 /usr/share/enipedia/includes/WikiPage.php(2914): Parser->parse('{{PowerplantTes...', Object(Title), Object(ParserOptions), true, true, 319913)
#19 /usr/share/enipedia/includes/PoolCounter.php(187): PoolWorkArticleView->doWork()
#20 /usr/share/enipedia/includes/Article.php(587): PoolCounterWork->execute()
#21 /usr/share/enipedia/includes/actions/ViewAction.php(40): Article->view()
#22 /usr/share/enipedia/includes/Wiki.php(484): ViewAction->show()
#23 /usr/share/enipedia/includes/Wiki.php(278): MediaWiki->performAction(Object(Article))
#24 /usr/share/enipedia/includes/Wiki.php(593): MediaWiki->performRequest()
#25 /usr/share/enipedia/includes/Wiki.php(503): MediaWiki->main()
#26 /usr/share/enipedia/index.php(58): MediaWiki->run()
#27 {main}

#0 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/sparql/SMW_SparqlDatabase.php(480): SMWSparqlDatabase->throwSparqlErrors('http://enipedia...', 'PREFIX wiki: <h...')
#1 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/sparql/SMW_SparqlDatabase.php(260): SMWSparqlDatabase->doQuery('PREFIX wiki: <h...')
#2 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/storage/SMW_SparqlStoreQueryEngine.php(340): SMWSparqlDatabase->select('?result', '?result propert...', Array, Array)
#3 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/storage/SMW_SparqlStore.php(365): SMWSparqlStoreQueryEngine->getInstanceQueryResult(Object(SMWQuery))
#4 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/SMW_QueryProcessor.php(395): SMWSparqlStore->getQueryResult(Object(SMWQuery))
#5 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/SMW_QueryProcessor.php(361): SMWQueryProcessor::getResultFromQuery(Object(SMWQuery), Array, Array, 2, 1, 'table')
#6 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/SMW_QueryProcessor.php(339): SMWQueryProcessor::getResultFromQueryString('[[Is availabili...', Array, Array, 2, 1)
#7 /usr/share/enipedia/extensions/SemanticMediaWiki/includes/parserhooks/SMW_Ask.php(34): SMWQueryProcessor::getResultFromFunctionParams(Array, 2)
#8 [internal function]: SMWAsk::render(Object(Parser), '[[Is availabili...', 'mainlabel=-', '?Percent', '?Year', 'sort=Year', 'order=ascending')
#9 /usr/share/enipedia/includes/parser/Parser.php(3189): call_user_func_array(Array, Array)
#10 /usr/share/enipedia/includes/parser/Preprocessor_DOM.php(1043): Parser->braceSubstitution(Array, Object(PPTemplateFrame_DOM))
#11 /usr/share/enipedia/includes/parser/Parser.php(3344): PPFrame_DOM->expand(Object(PPNode_DOM))
#12 /usr/share/enipedia/includes/parser/Preprocessor_DOM.php(1043): Parser->braceSubstitution(Array, Object(PPTemplateFrame_DOM))
#13 /usr/share/enipedia/includes/parser/Parser.php(3349): PPFrame_DOM->expand(Object(PPNode_DOM))
#14 /usr/share/enipedia/includes/parser/Preprocessor_DOM.php(1043): Parser->braceSubstitution(Array, Object(PPFrame_DOM))
#15 /usr/share/enipedia/includes/parser/Parser.php(2978): PPFrame_DOM->expand(Object(PPNode_DOM), 0)
#16 /usr/share/enipedia/includes/parser/Parser.php(1094): Parser->replaceVariables('{{PowerplantTes...')
#17 /usr/share/enipedia/includes/parser/Parser.php(345): Parser->internalParse('{{PowerplantTes...')
#18 /usr/share/enipedia/includes/WikiPage.php(2914): Parser->parse('{{PowerplantTes...', Object(Title), Object(ParserOptions), true, true, 319913)
#19 /usr/share/enipedia/includes/PoolCounter.php(187): PoolWorkArticleView->doWork()
#20 /usr/share/enipedia/includes/Article.php(587): PoolCounterWork->execute()
#21 /usr/share/enipedia/includes/actions/ViewAction.php(40): Article->view()
#22 /usr/share/enipedia/includes/Wiki.php(484): ViewAction->show()
#23 /usr/share/enipedia/includes/Wiki.php(278): MediaWiki->performAction(Object(Article))
#24 /usr/share/enipedia/includes/Wiki.php(593): MediaWiki->performRequest()
#25 /usr/share/enipedia/includes/Wiki.php(503): MediaWiki->main()
#26 /usr/share/enipedia/index.php(58): MediaWiki->run()
#27 {main}