DomFileDescription Question

I have a DomElement interface and a DomFileDescription. I've written plugins with the DOM classes before, but I'm at a loss when I received this error.  Any help would be appreciated.  I'm debugging the plugin in 9.0.4.

public interface Config extends DomElement {

}

public class ConfigurationDomFileDescription extends DomFileDescription<Config> {

    public ConfigurationDomFileDescription() {
        super(Config.class, "configuration");
    }

    @Override
    protected void initializeFileDescription() {
        
    }
}

java.lang.RuntimeException: java.lang.IllegalArgumentException: class Config$$EnhancerByCGLIB$$a658d383 is not an enhanced class
    at net.sf.cglib.proxy.AdvancedProxy.createProxy(AdvancedProxy.java:146)
    at net.sf.cglib.proxy.AdvancedProxy.createProxy(AdvancedProxy.java:93)
    at net.sf.cglib.proxy.AdvancedProxy.createProxy(AdvancedProxy.java:79)
    at com.intellij.util.xml.impl.DomInvocationHandler.<init>(DomInvocationHandler.java:124)
    at com.intellij.util.xml.impl.DomRootInvocationHandler.<init>(DomRootInvocationHandler.java:35)
    at com.intellij.util.xml.impl.DomFileElementImpl.<init>(DomFileElementImpl.java:132)
    at com.intellij.util.xml.impl.FileDescriptionCachedValueProvider.a(FileDescriptionCachedValueProvider.java:116)
    at com.intellij.util.xml.impl.FileDescriptionCachedValueProvider.getFileElement(FileDescriptionCachedValueProvider.java:75)
    at com.intellij.util.xml.impl.DomManagerImpl.getFileElement(DomManagerImpl.java:414)
    at com.intellij.util.xml.impl.DomManagerImpl.getDomFileDescription(DomManagerImpl.java:481)
    at com.intellij.util.xml.impl.DomManagerImpl.getFileElement(DomManagerImpl.java:424)
    at com.intellij.util.xml.impl.DomManagerImpl.getFileElement(DomManagerImpl.java:60)
    at com.intellij.util.xml.highlighting.DomElementsInspection.checkFile(DomElementsInspection.java:118)
    at com.intellij.codeInspection.LocalInspectionTool$1.visitFile(LocalInspectionTool.java:87)
    at com.intellij.psi.impl.source.xml.XmlFileImpl.accept(XmlFileImpl.java:64)
    at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass$1.process(LocalInspectionsPass.java:215)
    at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass$1.process(LocalInspectionsPass.java:195)
    at com.intellij.concurrency.JobUtil$2$1.run(JobUtil.java:94)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl$2.run(ProgressManagerImpl.java:198)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:223)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcess(ProgressManagerImpl.java:189)
    at com.intellij.concurrency.JobUtil$2.process(JobUtil.java:92)
    at com.intellij.concurrency.JobUtil$1.run(JobUtil.java:59)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at com.intellij.concurrency.JobImpl.scheduleAndWaitForResults(JobImpl.java:77)
    at com.intellij.concurrency.JobUtil.invokeConcurrentlyForAll(JobUtil.java:71)
    at com.intellij.concurrency.JobUtil.invokeConcurrentlyUnderMyProgress(JobUtil.java:89)
    at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.a(LocalInspectionsPass.java:195)
    at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.b(LocalInspectionsPass.java:118)
    at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.collectInformationWithProgress(LocalInspectionsPass.java:105)
    at com.intellij.codeInsight.daemon.impl.ProgressableTextEditorHighlightingPass.doCollectInformation(ProgressableTextEditorHighlightingPass.java:52)
    at com.intellij.codeHighlighting.TextEditorHighlightingPass.collectInformation(TextEditorHighlightingPass.java:54)
    at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass$1$1.run(PassExecutorService.java:329)
    at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:924)
    at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass$1.run(PassExecutorService.java:321)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:223)
    at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.run(PassExecutorService.java:319)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)