Coverage has generated reports, but covertura gets a ClassCastException

When running I get this error:

Ran 7 tests in 2.875s

OK

Creating test database for alias 'default'...
Creating UserProfiles for users made with createsuperuser or syncdb.
Creating UserProfiles for users made with createsuperuser or syncdb.
Destroying test database for alias 'default'...
Terminating xvnc.
$ vncserver -kill :10
Killing Xvnc4 process ID 3891
Publishing Cobertura coverage report...
ERROR: Publisher hudson.plugins.cobertura.CoberturaPublisher aborted due to exception
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.reset(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.reset(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.reset(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.init(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.<init>(Unknown Source)
at com.sun.xml.internal.stream.XMLInputFactoryImpl.getXMLStreamReaderImpl(Unknown Source)
at com.sun.xml.internal.stream.XMLInputFactoryImpl.createXMLStreamReader(Unknown Source)
at com.sun.xml.internal.stream.XMLInputFactoryImpl.createXMLEventReader(Unknown Source)
at hudson.plugins.cobertura.CoberturaPublisher$ParseReportCallable.invoke(CoberturaPublisher.java:546)
at hudson.plugins.cobertura.CoberturaPublisher$ParseReportCallable.invoke(CoberturaPublisher.java:529)
at hudson.FilePath.act(FilePath.java:839)
at hudson.FilePath.act(FilePath.java:821)
at hudson.plugins.cobertura.CoberturaPublisher.perform(CoberturaPublisher.java:335)
at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:710)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:685)
at hudson.model.Build$RunnerImpl.post2(Build.java:162)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:632)
at hudson.model.Run.run(Run.java:1463)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:239)
Recording test results
Sending e-mails to: stuart.axon@jpcreative.co.uk

Finished: FAILURE