Jasper reports 列标题在输出中不可见

我有一个JRXML文件，当我试图将它编译成jasper时，它显示了一些错误

我的JRXML文件：

当我试图编译为jasper时，它显示以下错误

net.sf.jasperreports.engine.JRException: Document root element "jasperReport", must match DOCTYPE root "null".
    at net.sf.jasperreports.engine.xml.JRXmlLoader.loadXML(JRXmlLoader.java:242)
    at net.sf.jasperreports.engine.xml.JRXmlLoader.loadXML(JRXmlLoader.java:225)
    at net.sf.jasperreports.engine.xml.JRXmlLoader.load(JRXmlLoader.java:213)
    at net.sf.jasperreports.engine.xml.JRXmlLoader.load(JRXmlLoader.java:167)
    at net.sf.jasperreports.engine.xml.JRXmlLoader.load(JRXmlLoader.java:151)
    at net.sf.jasperreports.engine.JasperCompileManager.compileReportToFile(JasperCompileManager.java:107)
    at com.inv.util.comp.main(comp.java:18)
Caused by: org.xml.sax.SAXParseException: Document root element "jasperReport", must match DOCTYPE root "null".
    at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
    at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
    at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
    at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
    at org.apache.xerces.impl.dtd.XMLDTDValidator.rootElementSpecified(Unknown Source)
    at org.apache.xerces.impl.dtd.XMLDTDValidator.handleStartElement(Unknown Source)
    at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentScannerImpl$ContentDispatcher.scanRootElementHook(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    at org.apache.commons.digester.Digester.parse(Digester.java:1745)
    at net.sf.jasperreports.engine.xml.JRXmlLoader.loadXML(JRXmlLoader.java:238)
    ... 6 more

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您确定这是您的整个模板吗？例如，这是我的文件头的一部分：。异常告诉您jasperReport根元素。可能是您的模板已损坏