LS-DYNA error message

[Tika74]

When I run my LS-DYNA keyword file(beam16.k), I get this error message "Thin shell element #something has been assigned a material number that is not flagged as a thin shell material".
Though, I used a simple material (model 3) which is adapted to the tutorial that I am following(DESCRIPT see page 12, sample 5).

What can I do to debug it?

 

[missil3]

May be a bit late to answer question, but are you using the latest version of Lsdyna solver and the keyword file is written for that version ?