Unable to launch NAnt script - Failure scanning JetBrains.BuildServer.NAntLoggers.dll for extensions

I'm running TeamCity Professional 6.5.3 (build 17985) and NAnt 0.90 (Build 0.90.3780.0; release; 5/8/2010).  Attempting to run a simple NAnt target from TeamCity results in the following error:

NAnt.exe -debug -buildfile:build.xml -extension:C:\BuildAgent\plugins\dotnetPlugin\bin\JetBrains.BuildServer.NAntLoggers.dll MyTarget

NAnt 0.90 (Build 0.90.3780.0; release; 5/8/2010)

Copyright (C) 2001-2010 Gerry Shaw

http://nant.sourceforge.net

BUILD FAILED

Failure scanning "C:\BuildAgent\plugins\dotnetPlugin\bin\JetBrains.BuildServer.NAntLoggers.dll" for extensions.

    Could not load file or assembly 'NAnt.Core, Version=0.85.2311.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.

Stacktrace:

Failure scanning "C:\BuildAgent\plugins\dotnetPlugin\bin\JetBrains.BuildServer.NAntLoggers.dll" for extensions.:

NAnt.Core.BuildException: Failure scanning "C:\BuildAgent\plugins\dotnetPlugin\bin\JetBrains.BuildServer.NAntLoggers.dll" for extensions. ---> System.IO.FileNotFoundException: Could not load file or assembly 'NAnt.Core, Version=0.85.2311.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.

File name: 'NAnt.Core, Version=0.85.2311.0, Culture=neutral, PublicKeyToken=null'

   at System.Reflection.Assembly._GetExportedTypes()

   at System.Reflection.Assembly.GetExportedTypes()

   at NAnt.Core.TypeFactory.ScanAssembly(Assembly assembly, Task task) in c:\BuildAgent\work\31e2a06e94b42384\MKEBuildTools\nant-0.90\src\NAnt.Core\TypeFactory.cs:line 117

   at NAnt.Core.TypeFactory.ScanAssembly(String assemblyFile, Task task) in c:\BuildAgent\work\31e2a06e94b42384\MKEBuildTools\nant-0.90\src\NAnt.Core\TypeFactory.cs:line 100

   at NAnt.Core.Tasks.LoadTasksTask.ExecuteTask() in c:\BuildAgent\work\31e2a06e94b42384\MKEBuildTools\nant-0.90\src\NAnt.Core\Tasks\LoadTasks.cs:line 148

WRN: Assembly binding logging is turned OFF.

To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.

Note: There is some performance penalty associated with assembly bind failure logging.

To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

   --- End of inner exception stack trace ---

   at NAnt.Core.Tasks.LoadTasksTask.ExecuteTask() in c:\BuildAgent\work\31e2a06e94b42384\MKEBuildTools\nant-0.90\src\NAnt.Core\Tasks\LoadTasks.cs:line 154

   at NAnt.Core.Task.Execute() in c:\BuildAgent\work\31e2a06e94b42384\MKEBuildTools\nant-0.90\src\NAnt.Core\Task.cs:line 186

   at NAnt.Core.ConsoleDriver.LoadExtensionAssemblies(StringCollection extensionAssemblies, Project project) in c:\BuildAgent\work\31e2a06e94b42384\MKEBuildTools\nant-0.90\src\NAnt.Core\ConsoleDriver.cs:line 400

   at NAnt.Core.ConsoleDriver.Main(String[] args) in c:\BuildAgent\work\31e2a06e94b42384\MKEBuildTools\nant-0.90\src\NAnt.Core\ConsoleDriver.cs:line 105

Removing the -extension:C:\BuildAgent\plugins\dotnetPlugin\bin\JetBrains.BuildServer.NAntLoggers.dll command line argument results in success.

My NAnt.Core.dll is 0.90.3780.0; do I need to find the 0.85.2311.0 version in order for this to work?  Or can JetBrains.BuildServer.NAntLoggers.dll use the latest 0.90 build?

Thanks,

Bryan