Could you check if the "gallio-report" file is under C:\BuildMaster_SVCTMP_A1004_S0\TMP and paste its contents here or email it to support@inedo.com? If you're familiar with C# you can see the code for the Gallio extension here: https://github.com/Inedo/bmx-gallio/blob/master/GallioUnitTestAction.cs - it's almost certainly caused by one of the DateTime.Parse() or Double.Parse() calls.