TFS Errors workspace does not exists

buildError.log

D:\Builds\01\src\External\Newtonsoft.Json.5.0.8\lib\net45\Newtonsoft.Json.xml: TF14061: The workspace 01_TFS-BUILD01;TFS_BuildService does not exist.
 Exception Message: TF14061: The workspace 01_TFS-BUILD01;TFS_BuildService does not exist. (type WorkspaceNotFoundException)
Exception Stack Trace: 
Server stack trace: 
   at Microsoft.TeamFoundation.Client.Channels.TfsHttpClientBase.HandleReply(TfsClientOperation operation, TfsMessage message, Object[]& outputs)
   at Microsoft.TeamFoundation.Client.Channels.TfsHttpClientBase.Invoke(TfsClientOperation operation, Object[] parameters, Object[]& outputs)
   at Microsoft.TeamFoundation.Client.Channels.TfsHttpClientBase.Invoke(TfsClientOperation operation, Object[] parameters)
   at Microsoft.TeamFoundation.VersionControl.Client.Repository5.UpdateLocalVersion(String workspaceName, String ownerName, ServerItemLocalVersionUpdate[] updates, Int32 maxClientPathLength)
   at Microsoft.TeamFoundation.VersionControl.Client.WebServiceLayer.UpdateLocalVersion(String workspaceName, String ownerName, ServerItemLocalVersionUpdate[] updates)
   at Microsoft.TeamFoundation.VersionControl.Client.UpdateLocalVersionQueue.SendToServer(ILocalVersionUpdate[] updates)
   at Microsoft.TeamFoundation.VersionControl.Client.UpdateLocalVersionQueue.FlushNoAcks()
   at Microsoft.TeamFoundation.VersionControl.Client.UpdateLocalVersionQueue.Dispose()
   at Microsoft.TeamFoundation.VersionControl.Client.Client.ProcessOperations(AsyncGetOperation asyncOp, GetOperation[] actions)
   at Microsoft.TeamFoundation.VersionControl.Client.Client.ProcessGetOperations(Workspace workspace, ProcessType type, RequestType requestType, GetOperation[][] results, GetOptions options, GetFilterCallback filterCallback, Object userData, Boolean deleteUndoneAdds, Boolean onlineOperation, ChangePendedFlags flags, Int32 operationId)
   at Microsoft.TeamFoundation.VersionControl.Client.Client.Get(Workspace workspace, GetRequest[] requests, GetOptions options, GetFilterCallback filterCallback, Object userData, String[] itemAttributeFilters, String[] itemPropertyFilters, Boolean alwaysQueryConflicts, Conflict[]& conflicts, Int32 operationId)
   at Microsoft.TeamFoundation.VersionControl.Client.Workspace.Get(GetRequest[] requests, GetOptions options, GetFilterCallback filterCallback, Object userData, String[] itemAttributeFilters, String[] itemPropertyFilters, Boolean alwaysQueryConflicts, Conflict[]& conflicts)
   at Microsoft.TeamFoundation.VersionControl.Client.Workspace.Get(GetRequest[] requests, GetOptions options, GetFilterCallback filterCallback, Object userData)
   at Microsoft.TeamFoundation.Build.Workflow.Activities.TfGet.TfGetCore.RunCommand(VersionControlScope versionControlScope, Workspace workspace, String getting, String nonFatalError, String version, String fileSpec, GetOptions options, RecursionType recursion)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.AsyncProcessMessage(IMessage msg, IMessageSink replySink)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.EndInvokeHelper(Message reqMsg, Boolean bProxyCase)
   at System.Runtime.Remoting.Proxies.RemotingProxy.Invoke(Object NotUsed, MessageData& msgData)
   at System.Func`9.EndInvoke(IAsyncResult result)
   at Microsoft.TeamFoundation.Build.Workflow.Activities.TfGet.TfGetCore.EndExecute(AsyncCodeActivityContext context, IAsyncResult result)
   at System.Activities.AsyncCodeActivity`1.System.Activities.IAsyncCodeActivity.FinishExecution(AsyncCodeActivityContext context, IAsyncResult result)
   at System.Activities.AsyncCodeActivity.CompleteAsyncCodeActivityData.CompleteAsyncCodeActivityWorkItem.Execute(ActivityExecutor executor, BookmarkManager bookmarkManager)

Inner Exception Details:

Exception Message: TF14061: The workspace 01_TFS-BUILD01;TFS_BuildService does not exist. (type SoapException)SoapException Details: <detail WorkspaceName="01_TFS-BUILD01" WorkspaceOwner="TFS_BuildService" />
Exception Stack Trace: