Failures of the glass lifting

Hello, I have a 2006 2.0 Chevrolet Astra. The other day I got out of the car and put the alrma and the self -hill perfectly, but the glass of the companion's door got off and climbed alone, when the engine of the rapping of that door makes a strong noise as it continues to try to climb the glass and then 2 strong horn are heard and the car is closed and with the alarm.