Error rendering groovy enums

[clover-html-report] Renderers:

{.groovy=com.atlassian.clover.reporters.html.source.groovy.GroovySourceRenderKit@3cbd0fa5, .java=com.cenqua.clover.reporters.html.source.java.JavaSourceRenderKit@204e38ca}

[clover-html-report] Found source renderer com.atlassian.clover.reporters.html.source.groovy.GroovySourceRenderKit for file Events.groovy
[clover-html-report] Rendering Events.groovy with renderer com.atlassian.clover.reporters.html.source.groovy.GroovySourceRenderKit
[clover-html-report] -1
[clover-html-report] java.lang.ArrayIndexOutOfBoundsException: -1java.lang.ArrayIndexOutOfBoundsException: -1
[clover-html-report] at com.cenqua.clover.registry.FileInfo$1.getOrCreateLineInfo(FileInfo.java:108)
[clover-html-report] at com.cenqua.clover.registry.FileInfo$1.visitClass(FileInfo.java:117)
[clover-html-report] at com.cenqua.clover.registry.ClassInfo.visitElements(ClassInfo.java:143)
[clover-html-report] at com.cenqua.clover.registry.FileInfo.visitElements(FileInfo.java:170)
[clover-html-report] at com.cenqua.clover.registry.FileInfo.getLineInfo(FileInfo.java:103)
[clover-html-report] at com.cenqua.clover.reporters.html.source.SourceRenderHelper.gatherSrcRenderInfo(SourceRenderHelper.java:155)
[clover-html-report] at com.cenqua.clover.reporters.html.source.SourceRenderHelper.insertLineInfosForFile(SourceRenderHelper.java:73)
[clover-html-report] at com.cenqua.clover.reporters.html.RenderFileAction.insertLineInfos(RenderFileAction.java:284)
[clover-html-report] at com.cenqua.clover.reporters.html.RenderFileAction.render(RenderFileAction.java:131)
[clover-html-report] at com.cenqua.clover.reporters.html.RenderFileAction.call(RenderFileAction.java:115)
[clover-html-report] at com.cenqua.clover.util.CloverExecutors$LoggingCallable.call(CloverExecutors.java:86)
[clover-html-report] at clover.retrotranslator.edu.emory.mathcs.backport.java.util.concurrent.FutureTask.run(FutureTask.java:178)
[clover-html-report] at clover.retrotranslator.edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1061)
[clover-html-report] at clover.retrotranslator.edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:575)
[clover-html-report] at java.lang.Thread.run(Thread.java:637)