Exit code 100 returned from process - error when getting source from TFS

The issue may related to the workspace, you could give a try with solution Error When Setting Clean = True on Windows

Looks like scorch is failing when the root sources folder (e.g. _work\1\s) is not mapped - i.e. workspace does not contain a root mapping. One not great workaround is to set a variable build.clean to all.

Create a mapping for the root as $/projectroot/* and keep the Local path field blank. This will only download single level folders as empty below the project root. This is a workaround.