Bug corrected in the distributed version 4.0 (and beyond):
Description: PIPELINE crashes (in Survey mode): Continuum image could not be created.
This was due to incorrect channel flagging when a strong/broad line is present close to the edge of a frequency band. In some cases, too many (if not all) channels were flagged, resulting in no continuum channels.
Recommandation: you may test first the line identification with the UV_PREVIEW command before starting the imaging process with the PIPELINE (adjusting TAPER, SMOOTH and CLIP variables may help, if the problem persists in exotic cases).