Hi Team,

I have downgraded Jenkins latest version to old version(2.48). I got below 
error message after launch the Jenkins. Please help me to fix this issues.

org.xmlpull.v1.XmlPullParserException: only 1.0 is supported as <?xml version 
not '1.1' (position: START_DOCUMENT seen <?xml version=\'1.1\'... @1:19) 
        at org.xmlpull.mxp1.MXParser.parseXmlDeclWithVersion(MXParser.java:2608)
        at org.xmlpull.mxp1.MXParser.parseXmlDecl(MXParser.java:2592)
        at org.xmlpull.mxp1.MXParser.parsePI(MXParser.java:2466)
        at org.xmlpull.mxp1.MXParser.parseProlog(MXParser.java:1447)
        at org.xmlpull.mxp1.MXParser.nextImpl(MXParser.java:1395)
        at org.xmlpull.mxp1.MXParser.next(MXParser.java:1093)
        at 
com.thoughtworks.xstream.io.xml.XppReader.pullNextEvent(XppReader.java:109)
Caused: com.thoughtworks.xstream.io.StreamException:  : only 1.0 is supported 
as <?xml version not '1.1' (position: START_DOCUMENT seen <?xml 
version=\'1.1\'... @1:19) 
        at 
com.thoughtworks.xstream.io.xml.XppReader.pullNextEvent(XppReader.java:124)
        at 
com.thoughtworks.xstream.io.xml.AbstractPullReader.readRealEvent(AbstractPullReader.java:148)
        at 
com.thoughtworks.xstream.io.xml.AbstractPullReader.readEvent(AbstractPullReader.java:141)
        at 
com.thoughtworks.xstream.io.xml.AbstractPullReader.move(AbstractPullReader.java:118)
        at 
com.thoughtworks.xstream.io.xml.AbstractPullReader.moveDown(AbstractPullReader.java:103)
        at com.thoughtworks.xstream.io.xml.XppReader.<init>(XppReader.java:63)
        at 
com.thoughtworks.xstream.io.xml.AbstractXppDriver.createReader(AbstractXppDriver.java:54)
        at 
com.thoughtworks.xstream.io.xml.AbstractXppDriver.createReader(AbstractXppDriver.java:65)
        at hudson.XmlFile.unmarshal(XmlFile.java:159)
Caused: java.io.IOException: Unable to read C:\Users\poo\.jenkins\config.xml
        at hudson.XmlFile.unmarshal(XmlFile.java:161)
        at jenkins.model.Jenkins.loadConfig(Jenkins.java:3022)
        at jenkins.model.Jenkins.access$1200(Jenkins.java:304)
        at jenkins.model.Jenkins$16.run(Jenkins.java:3040)
        at 
org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
        at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
        at jenkins.model.Jenkins$7.runTask(Jenkins.java:1064)
        at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)
        at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown 
Source)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown 
Source)
        at java.base/java.lang.Thread.run(Unknown Source)
Caused: org.jvnet.hudson.reactor.ReactorException
        at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:269)
        at jenkins.InitReactorRunner.run(InitReactorRunner.java:47)
        at jenkins.model.Jenkins.executeReactor(Jenkins.java:1088)
        at jenkins.model.Jenkins.<init>(Jenkins.java:904)
        at hudson.model.Hudson.<init>(Hudson.java:85)
        at hudson.model.Hudson.<init>(Hudson.java:81)
        at hudson.WebAppMain$3.run(WebAppMain.java:231)
Caused: hudson.util.HudsonFailedToLoad
        at hudson.WebAppMain$3.run(WebAppMain.java:248)


Regards,
Poovaraj

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