Keep getting this error when i try render a groom, any idea?


Error
Unable to save geometry for: /obj/Groom_hairgen/RENDER
SOP Error: Invalid source /obj/Groom_hairgen/python2
Error: Python error: Traceback (most recent call last):
File "<stdin>", line 87, in <module>
File "C:/PROGRA~1/SIDEEF~1/HOUDIN~1.499/houdini/python2.7libs\houpythonportion\Geometry.py", line 120, in addAttrib
create_local_variable)
File "C:/PROGRA~1/SIDEEF~1/HOUDIN~1.499/houdini/python2.7libs\hou.py", line 36520, in addAttrib
return _hou.Geometry_addAttrib(self, *args)
OperationFailed: The attempted operation failed.
The default value must contain at least one element
.