It is not clear what is going wrong, based on the error code. Did SARscape also invite you to save an Error Report file? If it did not, then you can force SARscape to create an Error Report after the processing stops with this error code, by choosing (from the ENVI Toolbox) SARscape > Administration > Save Error Report. Either way, you can then send the Error Report file to your local distributor or Harris Geospatial Tech Support, and we may be able to see come clues about what may be going wrong for you. In general, it is better to use more datasets in your stack if possible. SBAS can work with as few as 7 or 8 datasets, in an area with good coherence between datasets (i.e., in an urban area). But unless you have more like 20+ datasets, the results will probably be very noisy. And if the whole area in the datasets is moving, then that movement will not be detectable via SBAS. Persistent Scattering would need to be used in that case. Regards, Peg