NPE: how to use this correctly?
4:12:26,697 INFO Builder:318 - Connection to Postgres established with URL: jdbc:postgresql://localhost:5432/rdf_1_cl_deputes_politicians with user kwsearch and password 14:12:26,697 INFO Builder:339 - Summarizing graph from Postgres Total time: 22955 ms. Exception in thread "main" java.lang.NullPointerException at fr.inria.cedar.quotientSummary.Summary.setGenericProperties(Summary.java:149) at fr.inria.cedar.quotientSummary.Traverser.setUp(Traverser.java:57) at fr.inria.cedar.quotientSummary.DataFirstTwoPassTraverser.traverseAllTriples(DataFirstTwoPassTraverser.java:17) at fr.inria.cedar.quotientSummary.Summary.summarizeFromPostgres(Summary.java:501) at fr.inria.cedar.quotientSummary.controller.Builder.summarizeGraphFromPostgres(Builder.java:344) at fr.inria.cedar.quotientSummary.controller.Builder.main(Builder.java:92) at fr.inria.cedar.connectionlens.sql.RDFDataSource.summarizeAndSaveGraph(RDFDataSource.java:539) at fr.inria.cedar.connectionlens.sql.RDFDataSource.postprocess(RDFDataSource.java:161) at fr.inria.cedar.connectionlens.ConnectionLens.register(ConnectionLens.java:440) at fr.inria.cedar.connectionlens.Experiment.registrationTest(Experiment.java:251) at fr.inria.cedar.connectionlens.Experiment.(Experiment.java:224) at fr.inria.cedar.connectionlens.Experiment.main(Experiment.java:564)