er.excel No Such Method Error exception

Exception in thread "WorkerThread0" com.webobjects.foundation.NSForwardException [java.lang.NoSuchMethodError] org.apache.poi.hssf.usermodel.HSSFRow.createCell(I)Lorg/apache/poi/hssf/usermodel/HSSFCell;:java.lang.NoSuchMethodError: org.apache.poi.hssf.usermodel.HSSFRow.createCell(I)Lorg/apache/poi/hssf/usermodel/HSSFCell;

at com.webobjects.foundation.NSForwardException._runtimeExceptionForThrowable(NSForwardException.java:41)

at com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:238)

at java.lang.Thread.run(Thread.java:613)

Caused by: java.lang.NoSuchMethodError: org.apache.poi.hssf.usermodel.HSSFRow.createCell(I)Lorg/apache/poi/hssf/usermodel/HSSFCell;

at er.excel.EGSimpleTableParser.parseTable(EGSimpleTableParser.java:358)

at er.excel.EGSimpleTableParser.parseNode(EGSimpleTableParser.java:261)

at er.excel.EGSimpleTableParser.parseNode(EGSimpleTableParser.java:268)

at er.excel.EGSimpleTableParser.parse(EGSimpleTableParser.java:246)

at er.excel.EGSimpleTableParser.workbook(EGSimpleTableParser.java:122)

at er.excel.EGSimpleTableParser.data(EGSimpleTableParser.java:110)

at er.excel.EGWrapper.appendToResponse(EGWrapper.java:95)

at com.webobjects.appserver._private.WOComponentReference.appendToResponse(WOComponentReference.java:135)

at com.webobjects.appserver._private.WODynamicGroup.appendChildrenToResponse(WODynamicGroup.java:126)

at com.webobjects.appserver._private.WODynamicGroup.appendToResponse(WODynamicGroup.java:136)

at com.webobjects.appserver.WOComponent.appendToResponse(WOComponent.java:1122)

at er.extensions.components.ERXComponent.appendToResponse(ERXComponent.java:107)

at com.webobjects.appserver.WOSession.appendToResponse(WOSession.java:1385)

at er.extensions.appserver.ERXSession.appendToResponse(ERXSession.java:540)

at com.webobjects.appserver.WOApplication.appendToResponse(WOApplication.java:1794)

at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedPage(WOComponentRequestHandler.java:242)

at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedSession(WOComponentRequestHandler.java:298)

at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedApplication(WOComponentRequestHandler.java:332)

at com.webobjects.appserver._private.WOComponentRequestHandler._handleRequest(WOComponentRequestHandler.java:369)

at com.webobjects.appserver._private.WOComponentRequestHandler.handleRequest(WOComponentRequestHandler.java:442)

at com.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java:1687)

at com.webobjects.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:144)

at com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:226)

... 1 more

Has anyone experienced a similar problem?

Thanks in advance,

Johnny