Console runner passes all tests, but returns failure

We are running our tests in TC using a grid of 3 machines.

The tests all run successfully (there are no failures) but yet the console runner always returns an output code of 1 which causes team city to think that the step failed.

The end of the log has this in it:

[12:09:55][Step 13/20] [12:09:55.1031-?-1] Reporting engine execution results
[12:09:55][Step 13/20] [12:09:55.4461-?-1] Shutting down engine
[12:09:55][Step 13/20] [12:09:55.7341-Core-96] Cleaning up workspace: C:\Users\UKSVC-Teamcity\AppData\Local\NCrunch\16712\1
[12:09:55][Step 13/20] [12:09:55.7811-Core-96] Cleaning up workspace: C:\Users\UKSVC-Teamcity\AppData\Local\NCrunch\16712\3
[12:09:55][Step 13/20] [12:09:55.8301-Core-96] Cleaning up workspace: C:\Users\UKSVC-Teamcity\AppData\Local\NCrunch\16712\6
[12:09:55][Step 13/20] [12:09:55.9351-Core-96] Cleaning up workspace: C:\Users\UKSVC-Teamcity\AppData\Local\NCrunch\16712\5
[12:09:56][Step 13/20] [12:09:56.7151-Core-96] Cleaning up workspace: C:\Users\UKSVC-Teamcity\AppData\Local\NCrunch\16712\8
[12:09:56][Step 13/20] [12:09:56.8711-Core-96] Cleaning up workspace: C:\Users\UKSVC-Teamcity\AppData\Local\NCrunch\16712\2
[12:09:56][Step 13/20] [12:09:56.9221-Core-96] Cleaning up workspace: C:\Users\UKSVC-Teamcity\AppData\Local\NCrunch\16712\7
[12:09:57][Step 13/20] [12:09:57.0151-Core-96] Cleaning up workspace: C:\Users\UKSVC-Teamcity\AppData\Local\NCrunch\16712\4
[12:09:59][Step 13/20] [12:09:59.6757-?-1] Returning result: BuildFailure

but We can't see why it should think it failed.

Any pointers on how we can diagnose the issue?

Hi, thanks for sharing this.

Is it possible that your solution includes a project that NCrunch doesn't support and isn't required for your tests? This is probably a stupid question, but does the HTML report show any build failures?

If you like, you can upload the log file using the contact form and I'll take a look over it.