node numbering

Hi all,

 I'm trying to model a 2D cohesive layer with a zero-thickness in Abaqus (6.11.2)

The shape of the layer is a quarter circle.

When modelling this i first create a cohesive layer with a certain thickness.

I then convert the part of this cohesive layer to a orphan mesh, then edit the mesh, such that a zero thickness layer is created.

However when i want to submit the job i get the following error message: