How to repair this error? Help me.

[nnvkct]

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And the next question is: How's to simulate this simple circuit in breadboard? I don't see the LED is on in breadboard.
I would appreciate any help. Thanks.

[lacy]

The first part of your question is simple (I think). Once you activate your circuit the LED comes on. If you deactivate your circuit at thios point it will look like it is on until you hit the switch again and then it will blink off and then on again. I have run across this with Multisim 2001, I just either ignore it or put a switch in series with my power source to turn it off before deactivating the simulation.

I have no idea on the second part of your question and will let someone else have a crack at that one.

[nestor-sg]

Lacy is right, your simulation ended with the LED on the ON state, and that's where it finish, it won't 'turn-off' the circuit. However, when you re-start your simulation, it will go back to the initial state and start over.

For your second question... the breadboard has no simulation capabilities. On the breadboard you can place the components and wires, virtually, and perform a connectivity check, if your connectivity is all right then go ahead and build your real prototype with the same connectivity diagram that you have on the breadboard. So the reason to have a 3D breadboard is so you can check the wire connectivity that you will later on build for real, is not used for simulation.