azure-pipelines-tasks: Error when getting source from TFS

A build is intermittently getting this error when fetching source from TFS:

2017-03-23T23:49:31.0591599Z ##[section]Starting: Build solution Roster.WebService.sln
2017-03-23T23:49:31.0591599Z ==============================================================================
2017-03-23T23:49:31.0591599Z Task         : Visual Studio Build
2017-03-23T23:49:31.0591599Z Description  : Build with MSBuild and set the Visual Studio version property
2017-03-23T23:49:31.0591599Z Version      : 1.113.0
2017-03-23T23:49:31.0591599Z Author       : Microsoft Corporation
2017-03-23T23:49:31.0591599Z Help         : [More Information](https://go.microsoft.com/fwlink/?LinkID=613727)
2017-03-23T23:49:31.0591599Z ==============================================================================
2017-03-23T23:49:31.6529233Z Unable to determine the workspace. You may be able to correct this by running 'tf workspaces /collection:TeamProjectCollectionUrl'.
2017-03-23T23:49:31.8872843Z ##[error]Exit code 100 returned from process: file name 'tf', arguments 'vc resolvePath "$\My Development\Trunk\src\Rostering\trunk\Roster.WebService.sln" /loginType:OAuth /login:.,******** /noprompt'.
2017-03-23T23:49:31.8872843Z ##[section]Finishing: Build solution Roster.WebService.sln