Plugin no longer working after upgrade to 15509

Build 'Test :: Test1' #31
Started 'Fri Oct 08 12:59:13 CEST 2010' on 'DefaultAgent' by 'you'
Finished 'Fri Oct 08 12:59:13 CEST 2010' with status 'ERROR Failure'
TeamCity URL http://localhost:81/viewLog.html?buildId=39&buildTypeId=bt2

[12:59:13]: bt2
[12:59:13]: Checking for changes
[12:59:13]: Clearing temporary directory: E:\TeamCity\buildAgent\temp\buildTmp
[12:59:13]: Checkout directory: E:\TeamCity\buildAgent\work\3de96e708f2408e
[12:59:13]: Updating sources: server side checkout...
[12:59:13]:  [Updating sources: server side checkout...] Repository sources transferred
[12:59:13]: Build preparation done
[12:59:13]:  BuildStageExecutionException when running build stage  ForEachBuildRunnerStage: Stage class  jetbrains.buildServer.agent.impl.buildStages.runnerStages.start.CallRunnerStage  failed.  jetbrains.buildServer.agent.runner.SimpleProgramCommandLine.<init>(Ljetbrains/buildServer/agent/AgentRunningBuild;Ljava/lang/String;Ljava/util/List;)V
[12:59:13]:   jetbrains.buildServer.agent.impl.buildStages.RunnerStageExecutionException:   jetbrains.buildServer.agent.runner.SimpleProgramCommandLine.<init>(Ljetbrains/buildServer/agent/AgentRunningBuild;Ljava/lang/String;Ljava/util/List;)V
jetbrains.buildServer.agent.impl.buildStages.RunnerStageExecutionException:   jetbrains.buildServer.agent.runner.SimpleProgramCommandLine.<init>(Ljetbrains/buildServer/agent/AgentRunningBuild;Ljava/lang/String;Ljava/util/List;)V
at jetbrains.buildServer.agent.impl.buildStages.RunnerStagesExecutor$1.callStage(RunnerStagesExecutor.java:27)
at jetbrains.buildServer.agent.impl.buildStages.RunnerStagesExecutor$1.callStage(RunnerStagesExecutor.java:23)
at jetbrains.buildServer.agent.impl.buildStages.StagesExecutor.callRunStage(StagesExecutor.java:68)
at jetbrains.buildServer.agent.impl.buildStages.StagesExecutor.doStages(StagesExecutor.java:31)
at jetbrains.buildServer.agent.impl.buildStages.RunnerStagesExecutor.doStages(RunnerStagesExecutor.java:18)
at jetbrains.buildServer.agent.impl.buildStages.startStages.RunnerContextExecutor.callRunnerStages(RunnerContextExecutor.java:40)
at jetbrains.buildServer.agent.impl.buildStages.startStages.ForEachBuildRunnerStage.doBuildStage(ForEachBuildRunnerStage.java:44)
at jetbrains.buildServer.agent.impl.buildStages.BuildStagesExecutor$1.callStage(BuildStagesExecutor.java:26)
at jetbrains.buildServer.agent.impl.buildStages.BuildStagesExecutor$1.callStage(BuildStagesExecutor.java:24)
at jetbrains.buildServer.agent.impl.buildStages.StagesExecutor.callRunStage(StagesExecutor.java:68)
at jetbrains.buildServer.agent.impl.buildStages.StagesExecutor.doStages(StagesExecutor.java:31)
at jetbrains.buildServer.agent.impl.buildStages.BuildStagesExecutor.doStages(BuildStagesExecutor.java:19)
at jetbrains.buildServer.agent.impl.BuildRunAction.doStages(BuildRunAction.java:63)
at jetbrains.buildServer.agent.impl.BuildRunAction.runBuild(BuildRunAction.java:46)
at jetbrains.buildServer.agent.impl.BuildAgentImpl.doActualBuild(BuildAgentImpl.java:242)
at jetbrains.buildServer.agent.impl.BuildAgentImpl.access$100(BuildAgentImpl.java:46)
at jetbrains.buildServer.agent.impl.BuildAgentImpl$1.run(BuildAgentImpl.java:216)
at java.lang.Thread.run(Unknown Source)
Caused  by: java.lang.NoSuchMethodError:  jetbrains.buildServer.agent.runner.SimpleProgramCommandLine.<init>(Ljetbrains/buildServer/agent/AgentRunningBuild;Ljava/lang/String;Ljava/util/List;)V
at csharpRunner.agent.CSharpRunnerBuildService.makeProgramCommandLine(CSharpRunnerBuildService.java:33)
at jetbrains.buildServer.agent.runner2.GenericCommandLineBuildProcess.start(GenericCommandLineBuildProcess.java:67)
at jetbrains.buildServer.agent.impl.buildStages.runnerStages.start.CallRunnerStage.doBuildStage(CallRunnerStage.java:54)
at jetbrains.buildServer.agent.impl.buildStages.RunnerStagesExecutor$1.callStage(RunnerStagesExecutor.java:25)
... 17 more

[12:59:13]: Build finished