[net.sf.jasperreports.engine.fill.JRExpressionEvalException]

Hi, I am getting the same problem and am attaching the log what i got please do the favor.....

net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating expression :

Source text : (((JRDataSourceScriptlet)$P{REPORT_SCRIPTLET}).getField("designation"))

at net.sf.jasperreports.engine.fill.JREvaluator.evaluate(JREvaluator.java:197)

at net.sf.jasperreports.engine.fill.JRCalculator.evaluate(JRCalculator.java:537)

at net.sf.jasperreports.engine.fill.JRCalculator.evaluate(JRCalculator.java:505)

at net.sf.jasperreports.engine.fill.JRFillElement.evaluateExpression(JRFillElement.java:826)

at net.sf.jasperreports.engine.fill.JRFillTextField.evaluateText(JRFillTextField.java:368)

at net.sf.jasperreports.engine.fill.JRFillTextField.evaluate(JRFillTextField.java:353)

at net.sf.jasperreports.engine.fill.JRFillElementContainer.evaluate(JRFillElementContainer.java:275)

at net.sf.jasperreports.engine.fill.JRFillBand.evaluate(JRFillBand.java:426)

at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillColumnBand(JRVerticalFiller.java:1380)

at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillDetail(JRVerticalFiller.java:692)

at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart(JRVerticalFiller.java:255)

at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:113)

at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:879)

at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:801)

at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:89)

at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:601)

at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:517)

at net.sf.jasperreports.engine.JasperRunManager.runReportToPdf(JasperRunManager.java:385)

at EmployeeForm.printDetail(EmployeeForm.java:627)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at KeyValueCodingProtectedAccessor.methodValue(KeyValueCodingProtectedAccessor.java:60)

at com.webobjects.foundation.NSKeyValueCoding$_MethodBinding.valueInObject(NSKeyValueCoding.java:1134)

at com.webobjects.foundation.NSKeyValueCoding$DefaultImplementation.valueForKey(NSKeyValueCoding.java:1324)

at com.webobjects.appserver.WOComponent.valueForKey(WOComponent.java:1736)

at com.webobjects.foundation.NSKeyValueCoding$Utility.valueForKey(NSKeyValueCoding.java:447)

at com.webobjects.foundation.NSKeyValueCodingAdditions$DefaultImplementation.valueForKeyPath(NSKeyValueCodingAdditions.java:212)

at com.webobjects.appserver.WOComponent.valueForKeyPath(WOComponent.java:1804)

at com.webobjects.appserver._private.WOKeyValueAssociation.valueInComponent(WOKeyValueAssociation.java:50)

at com.webobjects.appserver._private.WOSubmitButton.invokeAction(WOSubmitButton.java:70)

at er.extensions.foundation.ERXPatcher$DynamicElementsPatches$SubmitButton.invokeAction(ERXPatcher.java:197)

at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)

at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)

at com.webobjects.appserver._private.WOConditional.invokeAction(WOConditional.java:86)

at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)

at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)

at er.extensions.components._private.ERXWOForm.invokeAction(ERXWOForm.java:221)

at com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)

at com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)

at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:1079)

at com.webobjects.appserver.WOSession.invokeAction(WOSession.java:1357)

at com.webobjects.appserver.WOApplication.invokeAction(WOApplication.java:1745)

at er.extensions.appserver.ajax.ERXAjaxApplication.invokeAction(ERXAjaxApplication.java:93)

at er.extensions.appserver.ERXApplication.invokeAction(ERXApplication.java:1863)

at com.webobjects.appserver._private.WOComponentRequestHandler._dispatchWithPreparedPage(WOComponentRequestHandler.java:206)

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 er.extensions.appserver.ERXApplication.dispatchRequestImmediately(ERXApplication.java:1978)

at er.extensions.appserver.ERXApplication.dispatchRequest(ERXApplication.java:1943)

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

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

at java.lang.Thread.run(Unknown Source)

Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Date

at Employee_1337004491700_314232.evaluate(Employee_1337004491700_314232:170)

at net.sf.jasperreports.engine.fill.JREvaluator.evaluate(JREvaluator.java:186)

... 56 more

[java.lang.NoClassDefFoundError: org/apache/commons]

How can i use Script class and configure that with our own java class. in iReports 2.0.Please provide any tutorial on script class usage.