Error reads: There are no closed shapes! Please check the drawing.
I think this probably means there is not a line segment not connected at some point.
I have created this same drawing 3 times in autocad, Export to BCC in dxf. I get the same error every time.
The last time I created the drawing in autocad I tested the drawing for being closed with the hatch command. In Acad if there is a line segment not connected you can not select a part to be hatched. I know from this all segments are connected before export.
Any Ideas?