"Application detected an unexpected fault" when opening the lab center tab in mtm

by XDK 31. December 2015 09:30




This exception may appear when the lab environments exist with no lab systems.


  • Open Microsoft SQL Server Management Studio.
  • Connect to the TFS collection database where your team project exist. 
  • Run the following SQL query to identify the lab environments with no lab systems:

Select le.LabEnvironmentId from LabEnvironment le where le.PartitionId = 1 And NOT EXISTS (Select * From LabSystem ls where ls.LabEnvironmentId = le.LabEnvironmentId AND ls.PartitionId = 1)

  • Note the Id's of the lab environment with no lab systems.
  • Remove all lab environments with no lab systems, by using the following SQL command for each lab environment IDs:

Exec DeleteLabEnvironment @PartitionId = 1, @labEnvironmentId = <Lab Environment ID>, @namespaceGuid = N'9E4894C3-FF9A-4EAC-8A85-CE11CAFDC6F1', @deleteTestMachines = 1, @pendingOperationId = Null



Azure DevOps on-premises | TFS 2012

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About the author

My name is Xavier Dilip Kumar Jayaraj having 16+ years of IT experience which includes solid experience and depth Knowledge in Application Life Cycle Management, Configuration Management, Implementation and Support using TFS on-premises and Azure DevOps. I have invested in gaining DevOps knowledege to expertise with Cloud Computing providers namely Microsoft Azure and Amazon Web Services in recent years. I am very positive to learn and adapt emerging technologies to client’s environment.

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The information provided here is based on my expreriences, troubleshooting and online/offline findings. It can be used as is on your own risk without any warranties and I impose no rights.