Graph visualization

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Internal error

Exception: HTTP error for SPARQL query: SELECT ?s ?p ?o (0 AS ?page) (1 AS ?inverse) ('' AS ?relation) WHERE { BIND("The elevation of a location (WGS 84). Values may be of the form 'NUMBER UNITOFMEASUREMENT' (e.g., '1,000 m', '3,200 ft') while numbers alone should be assumed to be a value in meters." AS ?s)?o ?p ?s} LIMIT 20 OFFSET 0 in /home/yago/website/content/graph.php:22 Stack trace: #0 /home/yago/website/content/graph.php(137): getSparqlQueryXmlDocument('\nSELECT ?s ?p ?...') #1 /home/yago/website/includes/functions.php(100): include('/home/yago/webs...') #2 /home/yago/website/template/template.php(32): page_content() #3 /home/yago/website/includes/functions.php(114): require('/home/yago/webs...') #4 /home/yago/website/index.php(10): init() #5 {main}#0 page_content() called at [/home/yago/website/template/template.php:32] #1 require(/home/yago/website/template/template.php) called at [/home/yago/website/includes/functions.php:114] #2 init() called at [/home/yago/website/index.php:10]