<p>When creating a new build in Team Foundation Server, I get the following error when attempting to run the new build:</p>

<blockquote>
  <p>The path
  C:\Build\ProductReleases\FullBuildv5.4.2x\Sources
  is already mapped to workspace
  BuildServer_23.</p>
</blockquote>

<p>I am unable to see a workspace by that name in the workspaces dialog.</p>

Use the command line utility
TF - Team Foundation Version Control Tool
(
tf
).
You can get a list of all workspaces by bringing up a
Visual Studio Command Prompt
then changing to your workspace folder and issuing the following commands:
```
```
C:\YourWorkspaceFolder>tf workspaces /owner:*
```
```
You should see your problem workspace in the list as well as it's owner.
You can delete the workspace with the following command:
```
```
C:\YourWorkspaceFolder>tf workspace /delete /server:BUILDSERVER WORKSPACENAME;OWNERNAME
```
```