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Errors were encountered when compiling report expressions class file: See error messages above. ApplicationDispatcher[/SGP] Servlet.service() for servlet jsp threw exception java.lang.NullPointerException
net.sf.jasperreports.engine.JRException: Errors were encountered when compiling report expressions class file: See error messages above. ApplicationDispatcher[/SGP] Servlet.service() for servlet jsp threw exception java.lang.NullPointerException	at org.apache.jsp.erros.general_jsp._jspService(general_jsp.java:38)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:353)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:412)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:318)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:397)	at org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:850)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:697)	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:532)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:465)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:353)	at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)	at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)	at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)	at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:318)	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:397)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:278)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:240)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:179)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:182)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)	at com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:137)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:239)	at com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)	at com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)	at com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)	at com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)	at com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)	at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)	at com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)