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org.apache.jena.sparql.resultset.ResultSetException: Not a string: key: value	at org.apache.jena.sparql.resultset.JSONInput.stringOrNull(JSONInput.java:230)	at org.apache.jena.sparql.resultset.JSONInput.parseOneTerm(JSONInput.java:201)	at org.apache.jena.sparql.resultset.JSONInput.parse(JSONInput.java:172)	at org.apache.jena.sparql.resultset.JSONInput.process(JSONInput.java:100)	at org.apache.jena.sparql.resultset.JSONInput.fromJSON(JSONInput.java:63)	at org.apache.jena.query.ResultSetFactory.fromJSON(ResultSetFactory.java:331)	at org.apache.jena.sparql.engine.http.QueryEngineHTTP.execResultSetInner(QueryEngineHTTP.java:385)	at org.apache.jena.sparql.engine.http.QueryEngineHTTP.execSelect(QueryEngineHTTP.java:351)