Xml Tomcat错误：prolog中不允许有内容

Tomcat报告xml错误，我花了几个小时试图修复这个错误，但没有成功。它说第1行第1列，我认为它们都是正确的。有没有关于如何解决这个问题的建议？我尝试了

atlassian-xml-cleaner-0.1.jar

从旧文件中创建一个新文件，但仍然得到了相同的错误

我有另一个服务器（生产），在那里我有相同的文件，它似乎工作得很好，虽然我没有尝试重新启动。我将xml从那个生产服务器复制到这个主机上，但仍然得到了错误

下面是所有4个xml的第1行

context.xml

<?xml version='1.0' encoding='utf-8'?>

请参阅：

<?xml version='1.0' encoding='utf-8'?>

<?xml version='1.0' encoding='utf-8'?>

<?xml version="1.0" encoding="ISO-8859-1"?>

Feb 29, 2020 5:36:48 AM org.apache.tomcat.util.digester.Digester fatalError
SEVERE: Parse Fatal Error at line 1 column 1: Content is not allowed in prolog.
org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; Content is not allowed in prolog.
        at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)
        at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:177)
        at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:400)
        at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327)
        at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1472)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:994)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602)
        at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:112)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:842)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:771)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
        at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1576)
        at org.apache.catalina.startup.TldConfig.tldScanStream(TldConfig.java:565)
        at org.apache.catalina.startup.TldConfig.tldScanWebXml(TldConfig.java:357)
        at org.apache.catalina.startup.TldConfig.execute(TldConfig.java:262)
        at org.apache.catalina.startup.TldConfig.lifecycleEvent(TldConfig.java:590)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
        at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5566)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1702)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1692)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)