How to properly reconstruct a model?

Dear all,

I have this code:

P = m{1,9};
Y = sim(net,P);
imdl =  mk_common_model('d2d1c',16);
img_1 = mk_image(imdl);
img_input = img_1;
img_2.elem_data = Y;
img_test=img_1;
img_test.elem_data=P;
figure
show_fem(img_test)
figure
show_fem(img_2);

I would like to receive the model (img_2) and the reconstructed model(img_test). But the reconstructed model (img_test) is displayed as a gray net and Comand Window reports EIDORS:[warning: image elements and mesh do not match. Showing grey]. I don´t know, where is a mistake.

Thank you for your answer.