Good day

I am trying to model a cohesive element COH3D8 with zero thickness between two shells (Figure 1 - Zoom in Figure 2). In the cohesive element, I have put two nodes at each point.  

For the boundary conditions, I have encastre on the left edge and a displacement (x-direction) on the right edge (Figure 3). The job was aborted for the next error:

THE COH3D8 ELEMENT 3 INSTANCE PART-1-1 HAS DEGENERATE VERTICES. THIS IS NOT ALLOWED

Which I am trying to do is possible? 

Attached are the figures and the INP file.

Thanks a lot!

Abaqus ​​​​​​​