XML parsing issue?

[ERROR] Some problems were encountered while processing the POMs
[ERROR] The build could not read 1 project -> [Help 1]
org.apache.maven.project.ProjectBuildingException: Some problems were encountered while processing the POMs
    at org.apache.maven.project.DefaultProjectBuilder$BuildSession.build(DefaultProjectBuilder.java:499)
    at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:235)
    at org.apache.maven.project.collector.DefaultProjectsSelector.selectProjects(DefaultProjectsSelector.java:61)
    at org.apache.maven.project.collector.RequestPomCollectionStrategy.collectProjects(RequestPomCollectionStrategy.java:49)
    at org.apache.maven.graph.DefaultGraphBuilder.getProjectsForMavenReactor(DefaultGraphBuilder.java:362)
    at org.apache.maven.graph.DefaultGraphBuilder.build(DefaultGraphBuilder.java:100)
    at org.apache.maven.DefaultMaven.buildGraph(DefaultMaven.java:629)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:250)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:225)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:149)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:958)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:205)
    at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
    at java.lang.reflect.Method.invoke(Method.java:580)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:255)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:201)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:361)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:314)
[ERROR]   
[ERROR]   The project (/home/cstamas/tmp/MNG-8188/pom.xml) has 1 error
[ERROR]     Non-parseable POM /home/cstamas/tmp/MNG-8188/pom.xml: Unable to read model: Illegal processing instruction target ("xml"); xml (case insensitive) is reserved by the specs.
[ERROR]      at [row,col,system-id]: [2,5,"file:///home/cstamas/tmp/MNG-8188/pom.xml"]
org.apache.maven.api.services.xml.XmlReaderException: Unable to read model: Illegal processing instruction target ("xml"); xml (case insensitive) is reserved by the specs.
 at [row,col,system-id]: [2,5,"file:///home/cstamas/tmp/MNG-8188/pom.xml"]
    at org.apache.maven.internal.impl.DefaultModelXmlFactory.read(DefaultModelXmlFactory.java:81)
    at org.apache.maven.internal.impl.DefaultModelXmlFactory.read(DefaultModelXmlFactory.java:46)
    at org.apache.maven.internal.impl.model.DefaultModelProcessor.doRead(DefaultModelProcessor.java:140)
    at org.apache.maven.internal.impl.model.DefaultModelProcessor.read(DefaultModelProcessor.java:115)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.doReadFileModel(DefaultModelBuilder.java:644)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.lambda$readFileModel$2(DefaultModelBuilder.java:623)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.lambda$asSupplier$10(DefaultModelBuilder.java:1394)
    at org.apache.maven.internal.impl.resolver.DefaultModelCache$CachingSupplier.get(DefaultModelCache.java:194)
    at org.apache.maven.internal.impl.resolver.DefaultModelCache.computeIfAbsent(DefaultModelCache.java:81)
    at org.apache.maven.internal.impl.resolver.DefaultModelCache.computeIfAbsent(DefaultModelCache.java:77)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.cache(DefaultModelBuilder.java:1387)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.readFileModel(DefaultModelBuilder.java:623)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.build(DefaultModelBuilder.java:208)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.build(DefaultModelBuilder.java:179)
    at org.apache.maven.project.DefaultProjectBuilder$BuildSession.build(DefaultProjectBuilder.java:585)
    at org.apache.maven.project.DefaultProjectBuilder$BuildSession.lambda$build$4(DefaultProjectBuilder.java:538)
    at java.util.concurrent.FutureTask.run(FutureTask.java:317)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
    at java.lang.Thread.run(Thread.java:1583)
Caused by: com.ctc.wstx.exc.WstxParsingException: Illegal processing instruction target ("xml"); xml (case insensitive) is reserved by the specs.
 at [row,col,system-id]: [2,5,"file:///home/cstamas/tmp/MNG-8188/pom.xml"]
    at com.ctc.wstx.sr.StreamScanner.constructWfcException(StreamScanner.java:634)
    at com.ctc.wstx.sr.StreamScanner.throwParseError(StreamScanner.java:504)
    at com.ctc.wstx.sr.BasicStreamReader.readPIPrimary(BasicStreamReader.java:4020)
    at com.ctc.wstx.sr.BasicStreamReader.nextFromProlog(BasicStreamReader.java:2156)
    at com.ctc.wstx.sr.BasicStreamReader.next(BasicStreamReader.java:1180)
    at org.apache.maven.model.v4.MavenStaxReader.read(MavenStaxReader.java:458)
    at org.apache.maven.model.v4.MavenStaxReader.read(MavenStaxReader.java:431)
    at org.apache.maven.internal.impl.DefaultModelXmlFactory.read(DefaultModelXmlFactory.java:68)
    at org.apache.maven.internal.impl.DefaultModelXmlFactory.read(DefaultModelXmlFactory.java:46)
    at org.apache.maven.internal.impl.model.DefaultModelProcessor.doRead(DefaultModelProcessor.java:140)
    at org.apache.maven.internal.impl.model.DefaultModelProcessor.read(DefaultModelProcessor.java:115)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.doReadFileModel(DefaultModelBuilder.java:644)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.lambda$readFileModel$2(DefaultModelBuilder.java:623)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.lambda$asSupplier$10(DefaultModelBuilder.java:1394)
    at org.apache.maven.internal.impl.resolver.DefaultModelCache$CachingSupplier.get(DefaultModelCache.java:194)
    at org.apache.maven.internal.impl.resolver.DefaultModelCache.computeIfAbsent(DefaultModelCache.java:81)
    at org.apache.maven.internal.impl.resolver.DefaultModelCache.computeIfAbsent(DefaultModelCache.java:77)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.cache(DefaultModelBuilder.java:1387)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.readFileModel(DefaultModelBuilder.java:623)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.build(DefaultModelBuilder.java:208)
    at org.apache.maven.internal.impl.model.DefaultModelBuilder.build(DefaultModelBuilder.java:179)
    at org.apache.maven.project.DefaultProjectBuilder$BuildSession.build(DefaultProjectBuilder.java:585)
    at org.apache.maven.project.DefaultProjectBuilder$BuildSession.lambda$build$4(DefaultProjectBuilder.java:538)
    at java.util.concurrent.FutureTask.run(FutureTask.java:317)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
    at java.lang.Thread.run(Thread.java:1583)