When an object is not found (https://github.com/PATRIC3/Workspace/blob/master/lib/Bio/P3/Workspace/WorkspaceImpl.pm#L208), the error message should include the path to the object. Without the path in the message the user doesn't know what was not found. For example, when the ProbModelSEED service retrieves various objects the error is passed through to the client and the user can't tell what is not found. Eventually figured out that a media object was not found ...