setParameters]: Unexpected Exception caught setting '

2009-01-18 22:24:09,234 DEBUG (org.apache.struts2.components.template.FreemarkerTemplateEngine:115) - Rendering template /template/simple/form-close.ftl 
 2009-01-18 22:24:16,375 DEBUG (org.apache.struts2.dispatcher.Dispatcher:635) - saveDir=d:/temp 
 2009-01-18 22:24:16,562 DEBUG (org.apache.struts2.dispatcher.multipart.MultiPartRequest:94) - Found item fileName 
 2009-01-18 22:24:16,562 DEBUG (org.apache.struts2.dispatcher.multipart.MultiPartRequest:116) - Item is a file upload 
 2009-01-18 22:24:16,796 ERROR (com.opensymphony.xwork2.interceptor.ParametersInterceptor:204) - ParametersInterceptor - [setParameters]: Unexpected Exception caught setting 'fileNameContentType' on 'class com.freshpower.bid.bm.action.ImpProjectAction: Error setting expression 'fileNameContentType' with value '[Ljava.lang.String;@1551b28' 
 2009-01-18 22:24:16,796 ERROR (com.opensymphony.xwork2.interceptor.ParametersInterceptor:204) - ParametersInterceptor - [setParameters]: Unexpected Exception caught setting 'fileNameFileName' on 'class com.freshpower.bid.bm.action.ImpProjectAction: Error setting expression 'fileNameFileName' with value '[Ljava.lang.String;@6a1b46' 
 2009-01-18 22:24:16,812 DEBUG (org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor:134) - Validating /struts/bm/impModel with method impProjectFile. 
 java.lang.reflect.InvocationTargetException 
 	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
 	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 
 	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 
 	at java.lang.reflect.Constructor.newInstance(Constructor.java:494) 
 	at org.apache.poi.hssf.record.RecordFactory.createRecord(RecordFactory.java:213) 
 	at org.apache.poi.hssf.record.RecordFactory.createRecords(RecordFactory.java:149) 
 	at org.apache.poi.hssf.usermodel.HSSFWorkbook. <init>(HSSFWorkbook.java:183) 
 	at org.apache.poi.hssf.usermodel.HSSFWorkbook. <init>(HSSFWorkbook.java:152) 
 	at com.freshpower.bid.common.util.ExcelReader.readExcelContent(ExcelReader.java:63) 
 	at com.freshpower.bid.bm.action.ImpProjectAction.impProjectFile(ImpProjectAction.java:64) 
 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
 	at java.lang.reflect.Method.invoke(Method.java:585) 
 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:404) 
 	at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:267) 
 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:229) 
 	at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:221) 
 	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86) 
 	at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224) 
 	at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223) 
 	at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455) 
 	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221) 
 	at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:150) 
 	at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept