Error while executing NUnit tests

An error occurs in BuildMaster when we try to run NUnit tests from buildmaster.

Configuration of the 'Execute NUnit Tests' action:
Source directory: C:\test
NUnit Exe Path: C:\Program Files (x86)\NUnit 2.6.3\bin\nunit-console.exe
.NET Framework Version: 4.0.30319
Test File: SyncForce.SalesOrder.ServiceTest.dll
Group Name: Test
Additional Argument:

If we run the unit tests from a command prompt, there are no problems. We used this command:
C:\Program Files (x86)\NUnit 2.6.3\bin>nunit-console.exe "C:\test\SyncForce.SalesOrder.ServiceTest.dll"

Here is the log:

DEBUG: AgentBasedAction Initialization Complete:DEBUG: Temp Directory: C:\BuildMaster_SVCTMP_A20_S24\TMPDEBUG: Source Directory: C:\testDEBUG: Target Directory: C:\BuildMaster_SVCTMP_A20_S24\WRKDEBUG: Server: SFEHVBLD002 (Id: 1)DEBUG: Initializing action...DEBUG: Initialization complete. Executing... INFO: Running unit tests...ERROR: An unhandled exception occurred while executing this action: System.InvalidCastException: Unable to cast object of type 'Inedo.BuildMaster.Extensibility.Agents.Local.LocalAgent' to type 'Inedo.BuildMaster.Extensibility.Agents.IFileOperationsExecuter'.
at Inedo.BuildMaster.Extensibility.Actions.Testing.UnitTestActionBase.Execute()
at Inedo.BuildMaster.Extensibility.Actions.ActionBase.ExecuteInternal(IActionExecutionContext context, ExtensionConfigurerBase extensionConfigurer, Boolean resumeNextOnError, Boolean logErrorsAsWarnings)

Thank you for the report - we have just released a new version of the extension that should resolve this issue.