I’m trying to get NUnit test output XML showing within TeamCity, but found that there are problems getting the test results in one nicely merged output file.  So I found a workaround developed by Davy Brion that I thought I’d try.

When I run it, however, I get:

D:\Program Files\TeamCity\buildAgent\work\15aafe2852f53ad5\zoka.solution.build(36, 3): error MSB4018: The “NUnitMergeOutput” task failed unexpectedly.
System.NullReferenceException: Object reference not set to an instance of an object.
at Brion.MSBuildTasks.NUnitMergeOutput.Execute()
at Microsoft.Build.BuildEngine.TaskEngine.ExecuteInstantiatedTask(EngineProxy engineProxy, ItemBucket bucket, TaskExecutionMode howToExecuteTask, ITask task, Boolean& taskResult)

Anybody have a clue what might be going on, or how to troubleshoot the error?