Undefined namespace prefix at 'dcterms' before '<Ontology>'

[freeman42x]

Error thrown on running index.fsx:

> Virtuoso 37000 Error SP030: SPARQL compiler, line 3: Undefined namespace prefix at 'dcterms' before '<Ontology>'

SPARQL query:
define sql:big-data-const 0 
#output-format:application/sparql-results+json
define sql:signal-void-variables 1 define input:default-graph-uri <http://dbpedia.org> SELECT ?uri WHERE {?uri dcterms:subject <Ontology>} ORDER BY ?uri LIMIT 2000
-------
   at FSharp.Data.JsonParser.throw[a]() in C:\Git\FSharp.Data\src\Json\JsonValue.fs:line 164
   at FSharp.Data.JsonParser.parseRootValue() in C:\Git\FSharp.Data\src\Json\JsonValue.fs:line 189
   at FSharp.Data.JsonParser.Parse() in C:\Git\FSharp.Data\src\Json\JsonValue.fs:line 330
   at FSharp.Data.JsonValue.Parse(String text, FSharpOption`1 cultureInfo) in C:\Git\FSharp.Data\src\Json\JsonValue.fs:line 347
   at DbPediaAccess.DbPediaConnection.getIndividuals(String uri) in D:\Sources\FSharp.Data.DbPedia\src\FSharp.Data.DbPedia\DbPediaAccess.fs:line 291
   at DbPediaAccess.DbPediaOntologyTypeBase..ctor(DbPediaConnection conn, String uri) in D:\Sources\FSharp.Data.DbPedia\src\FSharp.Data.DbPedia\DbPediaAccess.fs:line 339
   at <StartupCode$FSI_0004>.$FSI_0004.main@() in D:\Sources\FSharp.Data.DbPedia\docs\content\index.fsx:line 78
Stopped due to error