Make sure that you have installed your element into the oven compartment correctly. Elements sometimes have more than two wire terminals, in which case you need to properly transfer the wiring order. Your element might not be fully fitted into the element ports, or the ports might need to be cleaned or replaced before your stove will work again.
Your oven might have gone into an automatic lock procedure when you closed the door: Make sure the oven is unlocked and operating correctly. Double check to see if either the bake or broil function is being used. There could be a problem with the control panel itself if the element is working but the relays that power it have failed or are not receiving the proper signals.
The power to your oven could be off. Check the power cord to see if it is still unattached or if it is loose in the socket. If your power cord is attached, you might need to reset your electronic control panel to restore function. Unplug the oven, wait for 30 seconds and then plug it back in to see if it starts working properly again.
If your burner only flickers, or if it does not work at all and you have ruled out other causes, you might have an electrical problem deeper in your stove. The wiring could be faulty, or circuits could be damaged. This can happen when an old element burns out. If you have an ohmmeter, you can test element connections to see where failed wiring is located.