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skamalzare,

thank you for your quick response!!!!
I have already done it, but only for the structural nodes where i defined the masses. Even when I do that for all nodes , i keep getting the same message.
Have you ever try it in Navigator??

Hi, I want to model an SSI problem and i wonder if OpenSeesNavigator is appropriate for this case. Specifically, i am using plane strain quad elements (ndf) for soil and elastic beamcolumn elements (ndf=3) for the strusture. I open the model from a matlab file, where i have defined all the data. I h...