The full error looks like this:
ArcGISError: An ArcGIS geoprocessing function failed. This usually results from a problem with your inputs. Please check them and try again. Also review any preceding error messages and the detailed error information that appears at the end of this message. If you suspect the failure is due to a programming mistake in this tool or ArcGIS, please contact the author of this tool for assistance. Detailed error information: ArcGIS Row object 0x299EBD28: Invocation of setvalue(*args=('Shape', <geoprocessing array object object at 0x299EBE48>)) raised RuntimeError: ERROR 999999: Error executing function.
The coordinates or measures are out of bounds.
The failure only happens if the Y coordinates of the top and bottom extents of the resulting bounding box have the same sign (both positive or both negative), or if this situation is true for the X coordinates of the left and right extents.
I have a fix ready. It will be released in MGET 0.8 alpha 2.
