CI DotCover -3 ReturnCode

We are using CruiseControl, nant, nunit and dotCover for our CI build tasks.

I just got dotCover installed on the build server and ran the unit tests and coverage analysis. I am getting a return code of -3. Some of the unit tests are failing (which is ok at this point) but I am wondering if the -3 is because of the unit test failures? I can see in the Nant Output that the unit tests ran and everything looks good. Here are the last few lines from the NantOutPut:
...
[exec]                 Tests Not Run:
[exec]                 1) Ignored : CS.Services.NetSuiteService.Tests.NetSuiteServiceTests.DeleteSpecificJournalEntryValidInternalId
[exec]                 2) Ignored : CS.Services.NetSuiteService.Tests.NetSuiteServiceTests.SendJournalEntryValidMaxEntries
[exec]                 3) Ignored : CS.Services.NetSuiteService.Tests.NetSuiteServiceTests.TestResetPassword
[exec]                 Coverage session finished [1/10/2014 11:21:12 AM]
[exec]                 Analysed application exited with code '5'
[exec]                 Coverage results post-processing started [1/10/2014 11:21:12 AM]
[exec]                 Coverage results post-processing finished [1/10/2014 11:21:13 AM]
[exec]                 Report generation started [1/10/2014 11:21:13 AM]
[exec]                 Report generation finished [1/10/2014 11:21:16 AM]
[exec]                 e:\CCNet\SVNCheckouts\dev\trunk\CS_2.0\Q4.0-03\WebService\CS.WebService.NetSuiteService\NAnt3.build(169,8): External Program Failed: dotCover.exe (return code was -3)

I basically get the same results when I run dotCover from the console on my local drive, only difference is that I dont get the "External Program Failed: dotCover.exe (return code was -3"
Here are the results when I run it locally from the command prompt:

Tests Not Run:
1) Ignored : CS.Services.NetSuiteService.Tests.NetSuiteServiceTests.DeleteSpecificJournalEntryValidInternalId
2) Ignored : CS.Services.NetSuiteService.Tests.NetSuiteServiceTests.SendJournalEntryValidMaxEntries
3) Ignored : CS.Services.NetSuiteService.Tests.NetSuiteServiceTests.TestResetPassword
[JetBrains dotCover] Coverage session finished [1/10/2014 10:32:22 AM]
[JetBrains dotCover] Analysed application exited with code '3'
[JetBrains dotCover] Coverage results post-processing started [1/10/2014 10:32:22 AM]
[JetBrains dotCover] Coverage results post-processing finished [1/10/2014 10:32:23 AM]
[JetBrains dotCover] Report generation started [1/10/2014 10:32:23 AM]
[JetBrains dotCover] Report generation finished [1/10/2014 10:32:24 AM]

I dont get any error code return, it just comes back to the dos command prompt.

So is the error code just informing me that some of the unit tests failed?