VelocityServlet: Error processing the template

The column index is out of range: 2, number of columns: 1. (E0)
de.fuberlin.wiwiss.d2rq.D2RQException: The column index is out of range: 2, number of columns: 1. (E0) at de.fuberlin.wiwiss.d2rq.sql.QueryExecutionIterator.tryFetchNextRow(QueryExecutionIterator.java:87) at de.fuberlin.wiwiss.d2rq.sql.QueryExecutionIterator.hasNext(QueryExecutionIterator.java:47) at de.fuberlin.wiwiss.d2rq.sql.ApplyTripleMakerIterator.tryFillTripleQueue(ApplyTripleMakerIterator.java:65) at de.fuberlin.wiwiss.d2rq.sql.ApplyTripleMakerIterator.hasNext(ApplyTripleMakerIterator.java:35) at com.hp.hpl.jena.util.iterator.NiceIterator$1.hasNext(NiceIterator.java:86) at com.hp.hpl.jena.util.iterator.WrappedIterator.hasNext(WrappedIterator.java:64) at com.hp.hpl.jena.util.iterator.WrappedIterator.hasNext(WrappedIterator.java:64) at com.hp.hpl.jena.util.iterator.WrappedIterator.hasNext(WrappedIterator.java:64) at com.hp.hpl.jena.util.IteratorCollection.iteratorToList(IteratorCollection.java:52) at com.hp.hpl.jena.graph.impl.SimpleBulkUpdateHandler.addIterator(SimpleBulkUpdateHandler.java:57) at com.hp.hpl.jena.graph.impl.SimpleBulkUpdateHandler.add(SimpleBulkUpdateHandler.java:53) at com.hp.hpl.jena.rdf.model.impl.ModelCom.add(ModelCom.java:160) at de.fuberlin.wiwiss.d2rs.FindDescribeHandler.describe(FindDescribeHandler.java:42) at com.hp.hpl.jena.sparql.engine.QueryExecutionBase.execDescribe(QueryExecutionBase.java:204) at com.hp.hpl.jena.sparql.engine.QueryExecutionBase.execDescribe(QueryExecutionBase.java:136) at de.fuberlin.wiwiss.d2rs.PageServlet.handleRequest(PageServlet.java:45) at org.apache.velocity.servlet.VelocityServlet.doRequest(VelocityServlet.java:358) at org.apache.velocity.servlet.VelocityServlet.doGet(VelocityServlet.java:317) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) at org.mortbay.jetty.Server.handle(Server.java:324) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:829) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:513) at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380) at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228) at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)