Shut down internal simulation error

[dewey1]

Why does my circuit keep shutting down please, thanks.   Circuit enclosed.

[dewey1]

proper circuit, still shutting down.

[dewey1]

ANyone know why this is happening?

[derekdb]

Hi,

Can you elaborate a little bit on your problem? Your circuit seems to be working fine for me. I can simulate it and see the display changing numbers along when I toggle the swtiches.

Regards,