No cohesive element was generated, missing midside node(s) or other connectivity issues

[tnail]

Hello,

thread569-287729

My model is an fiber reinforced composite with two different ET. For the Fiber i have tetrahedral elements SOLID187 and von the matrix i use SOLID186. For the ET for the interface between these elements it is INTER204.
After selecting both elements for the CZMESH, this error occurs:

"No cohesive element was generated between solid elements xxx and xxx
(and possibly others) because of missing midside node(s) or other
connectivity issues."

I'm new in Ansys and i want to understand my problem. Why this warning come apart?

My CZM code:
VSEL,S,,,1,,1 ! This is the fiber volume
ESLV,S
CM,fiberElem,ELEM

VSEL,S,,,2,,1 ! This is the matrix volume
ESLV,S
CM, matrixElem, ELEM

TYPE,4 ! Interface element type INTER204
MAT,3 ! CZ material
REAL,0

CZMESH,fiberElem,matrixElem

After this, it shows me the interface elements (interface.png). But it seems that not all elements are CZE. (no cze.png)
My meshing: i take the frontarea from the matrix as 'startarea', mesh it with AMESH, and then sweeping to the backarea as 'targetarea'. Is there coming up these connectivity issues?

I would be very appreciate for your help.
With best regards
tnail