Element caught fire when i preheated my oven

I first turned the power supply off to my oven. Then I removed the two screws that hold the element in place. I then pulled the element out about 3 inches and disconnected the ends. After that I connected the new element to the wires on my oven and secured the element with the two screws and turned the power back on. I pushed the oven-on button and now I'm back in business.