Cannot save report in automated test NullPointerException

I am trying to save the output from automated load tests using the –r option. I just get a NullPointerException and nothing is saved. I am running LoadUI 2.7.0 on Windows 7. I’ve tried reinstalling the 64 bit version – I get the same exception with 32 or 64 bit.

I am trying to generate XML, but have also tried PDF. The command I am using is:

loadui-cmd.bat -p F:\LoadUI\HitLocalRuby.xml -v "WS Load" -L 10:0:0 -r F:\LoadUI\Reports -F XML

This is the error I am seeing:

14:12:52,279 ERROR [CommandRunner] An error occured when executing the script
java.lang.NullPointerException: Cannot get property 'label' on null object
at org.codehaus.groovy.runtime.NullObject.getProperty(NullObject.java:56)
at org.codehaus.groovy.runtime.InvokerHelper.getProperty(InvokerHelper.java:156)
at org.codehaus.groovy.runtime.callsite.NullCallSite.getProperty(NullCallSite.java:44)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGetProperty(AbstractCallSite.java:227)
at com.eviware.loadui.util.Script1.run(Script1.groovy:284)
at com.eviware.loadui.cmd.CommandRunner$CommandRunnable.run(CommandRunner.java:93)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)