Seismosoft | Earthquake Engineering Solutions

hi sometimes i have this error how can i solve it?

thank you very much , yes for the "u" traslation my question was, how i can see the results of the displacement born from the forces? (because in italian "u" is the displacement)

bye

<t>hi, i'm lorenzo i'm working alone on seismo struct for my graduation thesis but is not easy to get working on it,<br/>
1) wich is the function of the nodal constraint function?<br/>
2)if i want to apply a force with a sinusoidal trend what i have to do?<br/>
3)wich is the equivalent in this ...