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java.lang.NullPointerException: null at annis.sqlgen.AnnotatedMatchIterator.setSpanForAllMatchedPositions(AnnotatedMatchIterator.java:122)[annis-service-3.4.4.jar:na] at annis.sqlgen.AnnotatedMatchIterator.next(AnnotatedMatchIterator.java:70)[annis-service-3.4.4.jar:na] at annis.sqlgen.AnnotatedMatchIterator.next(AnnotatedMatchIterator.java:33)[annis-service-3.4.4.jar:na] at annis.WekaHelper.exportArffHeader(WekaHelper.java:55)[annis-service-3.4.4.jar:na] at annis.dao.QueryDaoImpl$4.doInConnection(QueryDaoImpl.java:749)[annis-service-3.4.4.jar:na] at annis.dao.QueryDaoImpl$4.doInConnection(QueryDaoImpl.java:719)[annis-service-3.4.4.jar:na] at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:342)[spring-jdbc-3.2.6.RELEASE.jar:3.2.6.RELEASE] at annis.dao.QueryDaoImpl.matrix(QueryDaoImpl.java:718)[annis-service-3.4.4.jar:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[na:1.7.0_101] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)[na:1.7.0_101] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[na:1.7.0_101] at java.lang.reflect.Method.invoke(Method.java:606)[na:1.7.0_101]