Q: Sliding door won't close with buttons

I’m having trouble with the driver’s side sliding door on my minivan. I can’t use the button to close it. Neither the button on the door, nor the button overhead on the driver’s side - they don’t work. The sliding door will open, but won’t close. I’ve tried flipping the overhead switch to close it manually, but 50% of the time it rips the door from my hand and opens it again. When I do get it to close and stay closed, the warning Ding-Ding-Ding won’t stop. Then the back interior lights don’t go off and there is no warning light on the dash to tell me that the door is open. There’s only one time it stops, for a second, and that’s when I push the power button to open it; however, when it is open, it immediately starts the Ding-Ding-Dinging! What will repair and fix this problem?