500 Server Error

An exception occured while handling your request.

javax.servlet.ServletException: In Template tag, error while invoking template extra/main.jsp : javax.servlet.ServletException: In Template tag, error while invoking template extra/template.jsp : javax.servlet.ServletException: In Template tag, error while evaluating expression : while evaluating : 
'extra/mod/' & location.module.MODULETEMPLATE 
             ^
Invalid right operand in concatenation expression near [&] at pos : 14

Traceback : 
javax.servlet.ServletException: In Template tag, error while invoking template extra/main.jsp : javax.servlet.ServletException: In Template tag, error while invoking template extra/template.jsp : javax.servlet.ServletException: In Template tag, error while evaluating expression : while evaluating : 
'extra/mod/' & location.module.MODULETEMPLATE 
             ^
Invalid right operand in concatenation expression near [&] at pos : 14
	at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:495)
	at org.apache.jsp.main_jsp._jspService(main_jsp.java:62)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:92)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:162)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:627)
	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:518)
	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:448)
	at spirit.runtime.engine.ViewInvoker.output(ViewInvoker.java:112)
	at spirit.runtime.shell.HttpRuntime.hit(HttpRuntime.java:121)
	at srt.service(srt.java:8)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
	at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
	at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
	at org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:409)
	at org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:528)
	at java.lang.Thread.run(Thread.java:534)