Unknow error with simulation

[GIMP]

Hello
Please help with the multiplier simulation.
Any scheme that I collect myself, or by example.
how to explain this? many people asked, no one knows
Thank you!

[Machop]

Can you please explain a little bit about what the issue is?

I found a document that explains a little about the multiplier

http://zone.ni.com/reference/en-XX/help/372062L-01/multisim/multiplier/

but any other information would be greatful.