Hi, I am new to JR and I don't know why this error: SettingsAdministratorDesktopcalendarcalendar.java net.sf.jasperreports.engine.design.JRValidationFault@2c3549Âjava.lang.ClassNotFoundException:ÂCalendarScriptlet Line:Â20,ÂColumn:Â29ÂJRXMLÂElement:Â/jasperReport net.sf.jasperreports.engine.design.JRValidationException:ÂReportÂdesignÂnotÂvalidÂ:Â ÂÂÂÂÂ1.Âjava.lang.ClassNotFoundException:ÂCalendarScriptlet ÂÂÂÂatÂnet.sf.jasperreports.engine.design.JRAbstractCompiler.verifyDesign(JRAbstractCompiler.java:260) ÂÂÂÂatÂnet.sf.jasperreports.engine.design.JRAbstractCompiler.compileReport(JRAbstractCompiler.java:144) ÂÂÂÂatÂit.businesslogic.ireport.IReportCompiler.run(IReportCompiler.java:591) ÂÂÂÂatÂjava.lang.Thread.run(UnknownÂSource). Can you help ? Thanks Camulatz PS What in your full version