Modeling in OBM

Hello,

I am modeling a skewed concrete slab bridge with 4 spans.

I was able to model the deck, the 3 piers and only one of the two abutments. When I try to model the second abutment, I get an error message "Attempt to determine its elevation failed".

What coul be the problem ? I checked several times the géometry file but I could not find the error.

Thanks.