[CIG-SHORT] Q8 Elements can't run in Pylith

[Ma, Xiao]

Hi,
I figure out how to implement Q8 element in Trelis, however after I generate the mesh with Q8 elements, the Pylith gives the error 'Topology can't  for cohesive cell' , I used to run with Q4 elements just fine, is this because of the addition nodes on the edges? Should I change something in the cohesive formulation?
Thank you
Xiao
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