I upgraded from iReport 3.6.0 to 3.6.1, imported my XML report datasource and opened a jrxml report created and working with version 3.6.0. But when I try to preview it in 3.6.1 I get the following error: Error filling print... java.lang.NoClassDefFoundError: org/apache/xpath/CachedXPathAPI java.lang.ClassNotFoundException: org.apache.xpath.CachedXPathAPI java.lang.NoClassDefFoundError: org/apache/xpath/CachedXPathAPI at net.sf.jasperreports.engine.util.xml.XalanXPathExecuter.<init>(XalanXPathExecuter.java:45) at net.sf.jasperreports.engine.util.xml.XalanXPathExecuterFactory.getXPathExecuter(XalanXPathExecuterFactory.java:39) at net.sf.jasperreports.engine.util.xml.JRXPathExecuterUtils.getXPathExecuter(JRXPathExecuterUtils.java:85) at net.sf.jasperreports.engine.data.JRXmlDataSource.<init>(JRXmlDataSource.java:172) at net.sf.jasperreports.engine.data.JRXmlDataSource.<init>(JRXmlDataSource.java:218) at com.jaspersoft.ireport.designer.connection.JRXMLDataSourceConnection.getJRDataSource(JRXMLDataSourceConnection.java:196) at com.jaspersoft.ireport.designer.IReportConnection.getJRDataSource(IReportConnection.java:71) at com.jaspersoft.ireport.designer.compiler.IReportCompiler.run(IReportCompiler.java:887) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997) Caused by: java.lang.ClassNotFoundException: org.apache.xpath.CachedXPathAPI at java.net.URLClassLoader$1.run(URLClassLoader.java:217) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:205) at java.lang.ClassLoader.loadClass(ClassLoader.java:323) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) at java.lang.ClassLoader.loadClass(ClassLoader.java:268) at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:252) at java.lang.ClassLoader.loadClass(ClassLoader.java:268) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:336) ... 10 more Print not filled. Try to use an EmptyDataSource... Any suggestion? Thanks, Gabriele