We are getting the following exception:
jetbrains.buildServer.vcs.VcsException: org.tmatesoft.svn.core.SVNException: svn: Failed to add directory 'src': an unversioned directory of the same name already exists
It appears the directory in question has not been cleaned properly. It is present on disk but missing its .svn folder. Sibling directories have no such problem.
Tried switching off "Clean all files before build", but the same thing occurs whenever changes are made to 'src'.