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java.sql.SQLException: Unknown column 'ls' in 'where clause'	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2851)	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1534)	at com.mysql.jdbc.ServerPreparedStatement.serverPrepare(ServerPreparedStatement.java:1485)	at com.mysql.jdbc.ServerPreparedStatement.(ServerPreparedStatement.java:151)	at com.mysql.jdbc.Connection.prepareStatement(Connection.java:1309)	at com.mysql.jdbc.Connection.prepareStatement(Connection.java:1281)	at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:351)	at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:302)	at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:85)	at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1090)	at org.hibernate.loader.Loader.doQuery(Loader.java:362)	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:203)	at org.hibernate.loader.Loader.doList(Loader.java:1499)	at org.hibernate.loader.Loader.list(Loader.java:1482)	at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:365)	at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:268)	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:782)	at org.hibernate.impl.QueryImpl.list(QueryImpl.java:74)	at de.w3s.webapp.struts.actions.SelectBlankQuestionnairesAction.execute(SelectBlankQuestionnairesAction.java:42)	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1192)	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:412)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:407)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:825)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:738)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:526)	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)	at java.lang.Thread.run(Unknown Source)