When parsing the attached file, following message is logged by xUnit:

Oct 12, 2011 6:03:12 PM com.thalesgroup.hudson.plugins.xunit.service.XUnitService errorSystemLogger
SEVERE: [xUnit] - The result file '/var/lib/jenkins/jobs/xUnit Test/workspace/Test_log.xml' for the metric 'BoostTest-1.x (default)' is not valid. The result file has been skipped.

The following text is shown in console:
[xUnit] [INFO] - Starting to record.
[xUnit] [INFO] - Processing BoostTest-1.x (default)
[xUnit] [WARNING] - Can't create the path /var/lib/jenkins/jobs/xUnit Test/workspace/generatedJUnitFiles. Maybe the directory already exists.
[xUnit] [INFO] - [BoostTest-1.x (default)] - 1 test report file(s) were found with the pattern 'Test_log.xml' relative to '/var/lib/jenkins/jobs/xUnit Test/workspace' for the testing framework 'BoostTest-1.x (default)'.
[xUnit] [ERROR] - The result file '/var/lib/jenkins/jobs/xUnit Test/workspace/Test_log.xml' for the metric 'BoostTest-1.x (default)' is not valid. The result file has been skipped.
[xUnit] [INFO] - Stopping recording.