Simulation of Reinforced Concrete Panel In Abaqus

Dear Subscribers 

I am a PhD Student and I am working on the shear behavior of reinforced concrete structures.I am a new user of Abaqus. I have simulated a concrete panel in a cobination with double steel rebars all together. The constraint between the steel grid an the Reinforce concrete element was the Ebbeded Region.After the analysis the job is aborted and the report of the error is 700 elements have missing property definitions.The elements have been identified i element set ErrElemMissingSection. 

Does anybody advise for this problem? To what part of simulation I have to check?

Best Regards 

Ioannou Anthos