2010, Mercedes E550 Not starting, Take Ignition Key Out Displays

My car will not start by pressing start button or by manually entering with either of my 2 keys. Everything powers on the car but when I press the start button it actually powers off the car, says please don't forget key and when I manually turned the key on. The car powers down and say to take ignition key out. I am getting reverse of what is suppose to happen. I am waiting for my mechanic to call me back. Any suggestions if its a simply reset or something would be amazing. Thank you.