problem with <nunit2> task using nant 0.92 and teamcity 7.0.3

I'm trying to migrate our builds from our old build toolsto a brand new teamcity 7.0.3. We have a bunch of nant script also executing unit test using the <nunit2> nant task.

The full configuration is ;
- nant 0.92
- nunit 2.6
- teamcity 7.0.3
- build in .net 3.5
- running under winxp

in the build process when comming to unit test I get the following error :

[15:35:40][call]  Method not found: 'NAnt.NUnit.Types.FormatterElementCollection  NAnt.NUnit2.Tasks.NUnit2Task.get_FormatterElements()'.  System.MissingMethodException: Method not found:  'NAnt.NUnit.Types.FormatterElementCollection  NAnt.NUnit2.Tasks.NUnit2Task.get_FormatterElements()'.

at  JetBrains.BuildServer.NAntLoggers.NUnit2LoggingTask.NUnit2TaskEx.ExecuteTask()

at NAnt.Core.Task.Execute()

at  NAnt.Core.TaskContainer.ExecuteChildTasks()

at  NAnt.Core.Tasks.IfTask.ExecuteTask()

at NAnt.Core.Task.Execute()

at  NAnt.Core.Target.Execute()

at NAnt.Core.Project.Execute(String  targetName, Boolean forceDependencies)

at  NAnt.Core.Tasks.CallTask.ExecuteTask() at NAnt.Core.Task.Execute()

at  NAnt.Core.Target.Execute()

at NAnt.Core.Project.Execute(String  targetName, Boolean forceDependencies)

at  NAnt.Core.Tasks.CallTask.ExecuteTask()

at NAnt.Core.Task.Execute()

at  NAnt.Core.Target.Execute()

at NAnt.Core.Project.Execute(String  targetName, Boolean forceDependencies)

at NAnt.Core.Project.Execute()

at  NAnt.Core.Project.Run()

[15:35:40]Process exited with code 1

[15:35:40]NAnt output

[15:35:40][NAnt output] end.log.daily:

[15:35:40][NAnt output]

[15:35:40][NAnt output]

[15:35:40][NAnt output] BUILD FAILED - 0 non-fatal error(s), 1 warning(s)

[15:35:40][NAnt output]

[15:35:40][NAnt output] INTERNAL ERROR

[15:35:40][NAnt output]

[15:35:40][NAnt  output] System.MissingMethodException: Method not found:  'NAnt.NUnit.Types.FormatterElementCollection  NAnt.NUnit2.Tasks.NUnit2Task.get_FormatterElements()'.

[15:35:40][NAnt output] at JetBrains.BuildServer.NAntLoggers.NUnit2LoggingTask.NUnit2TaskEx.ExecuteTask()

[15:35:40][NAnt output] at NAnt.Core.Task.Execute()

[15:35:40][NAnt output] at NAnt.Core.TaskContainer.ExecuteChildTasks()

[15:35:40][NAnt output] at NAnt.Core.Tasks.IfTask.ExecuteTask()

[15:35:40][NAnt output] at NAnt.Core.Task.Execute()

[15:35:40][NAnt output] at NAnt.Core.Target.Execute()

[15:35:40][NAnt output] at NAnt.Core.Project.Execute(String targetName, Boolean forceDependencies)

[15:35:40][NAnt output] at NAnt.Core.Tasks.CallTask.ExecuteTask()

[15:35:40][NAnt output] at NAnt.Core.Task.Execute()

[15:35:40][NAnt output] at NAnt.Core.Target.Execute()

[15:35:40][NAnt output] at NAnt.Core.Project.Execute(String targetName, Boolean forceDependencies)

[15:35:40][NAnt output] at NAnt.Core.Tasks.CallTask.ExecuteTask()

[15:35:40][NAnt output] at NAnt.Core.Task.Execute()

[15:35:40][NAnt output] at NAnt.Core.Target.Execute()

[15:35:40][NAnt output] at NAnt.Core.Project.Execute(String targetName, Boolean forceDependencies)

[15:35:40][NAnt output] at NAnt.Core.Project.Execute()

[15:35:40][NAnt output] at NAnt.Core.Project.Run()

[15:35:40][NAnt output]

[15:35:40][NAnt output] Please send bug report to ############

i've tried a bunch of things like seting properties in our nant script
<property name="teamcity.dotnet.nant.nunit2.platformVersion" value="v2.0" />

<property name="teamcity.dotnet.nant.nunit2.version" value="NUnit-2.6.0" />

then tring to override nunit2 task replacement
<property name="teamcity.dotnet.nant.replaceTasks" value="false" />

and still getting the same error code.

any idea about this ?

thanks