Creating a simple box - Error "Finger joints could not be completed..."

[heidenrb]

Hi,

i wanted to create a simple box with finger-joints at every edge.
On the one edge it works, on the other not.

I get the following error message:
"Finger joints could not be completed. Try selecting overlapping bodies and double-check the dimensions".

Here is what I did:

1. Simple sketch with layout, including wall width.
2. Extruded 4 seperate walls.
3. Extruded floor, and ceiling (with an offset plane).

Placing Finger joints between floor an wall works. Between 2 walls not.

I tried to place an sketch, to mark the joint from it, but it does not work.

Do you know what I'm doing wrong.

Best regards.
Benjamin