Topic: unassigned element see *.dat file

sir, during analysis i am getting this type of error "You don't have assigned Material 0 at Element
17132 For first number of unassigned element see *.dat file",sir how to solve this type of problem. Althogh i have  made my mode twice still i am facing same error, also i have already seen the trouble shooting ,still i cant solve that problem.Plese give some suggestion.

Re: unassigned element see *.dat file

Dear parimals, please see ATENA Troubleshooting, 4.2.5 GiD claims: You don't have assigned Material 0 at Element xxxx For first number of unassigned element see *.dat file. The PDF is included in ATENA installation and also available for separate download from our web (Products - ATENA - Documentation).