Build CI构建不再启动

在签入CI生成的更改时，我遇到以下错误：

TF215097: An error occurred while initializing a build for build definition \[builddefinitionofourcompany].: 
Exception Message: Derived method 'get_CredentialType' in type 'Microsoft.VisualStudio.Services.Client.VssFederatedCredential' from assembly 'Microsoft.VisualStudio.Services.Client, Version=12.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' cannot reduce access. (type TypeLoadException)
Exception Stack Trace:    at Microsoft.TeamFoundation.Client.TfsClientCredentialsConverter.ConvertToVssCredentials(TfsClientCredentials clientCredentials, Uri serverUri)
   at Microsoft.TeamFoundation.Client.TfsConnection.CreateVssConnection()
   at Microsoft.TeamFoundation.Client.TfsConnection.GetClientT
   at Microsoft.TeamFoundation.Build.Client.FileContainerHelper.GetFile(TfsTeamProjectCollection projectCollection, String itemPath, Stream outputStream)
   at Microsoft.TeamFoundation.Build.Client.FileContainerHelper.GetFileAsString(TfsTeamProjectCollection projectCollection, String itemPath)
   at Microsoft.TeamFoundation.Build.Client.ProcessTemplate.Download(String sourceGetVersion)
   at Microsoft.TeamFoundation.Build.Hosting.BuildControllerWorkflowManager.PrepareRequestForBuild(WorkflowManagerActivity activity, IBuildDetail build, WorkflowRequest request, IDictionary`2 dataContext)
   at Microsoft.TeamFoundation.Build.Hosting.BuildWorkflowManager.TryStartWorkflow(WorkflowRequest request, WorkflowManagerActivity activity, BuildWorkflowInstance& workflowInstance, Exception& error, Boolean& syncLockTaken)

这个凭证错误是什么？谷歌没有给出任何结果

谢谢

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蒂姆，我就是有这个问题。我转到TFS构建服务器，打开TeamFoundationServer管理控制台，“重新启动”最顶级的构建器，然后解决它