Join does not work...- please help

 From:  rayman
I set up this form using hexagons and used the line tool
with snapping on to fill in the rest of the form.
I think there should not be any open gap so the join
tool should actually work.... but it does NOT.:(
I tried to show someone at the Caligari forum how beatifilly
Moi works to do that kind of thing ... and then I fall int this problem
Any help ß
Here are the worksteps and the file