Hello Zdenek,
I simplified my model and removed some of my tiny elements and could remove that error.
So far, I have confronted some difficulties with ATENA which have really annoyed me;
1) I can not define a hook for my reinforcement.
2) I have confronted 4 errors.
1- out of memory
2- master-slave
3- Internal error in mesh generation
4- violating error criteria.
I could simplify my model and read through the unknown errors and overcome the first three, and now I am challenging the 4th one.
Will get back to you if I need any further help.
Thank you
Ahmad