You must provide the name of the staging-area blobspace on the STAGEBLOB parameter.
On UNIX, the blobspace name is the first field of the value of the STAGEBLOB parameter in the ONCONFIG file:
STAGEBLOB blobspace_name, num_optical_vps
On Windows, the name of the staging-area blobspace is the only value of the STAGEBLOB parameter in the ONCONFIG file:
STAGEBLOB blobspace_name