touchless door bell using ir proximity sensor

Hello, all from all about circuits. This is my first entry about hardware on sensor for my uni hardware assignment.
So i get this sensor set up on, well from utube and follow each one by one. All connections are i follow but the result i get is not satisfied.
The problem is the light and buzzer keep light on and buzzer keep buzzing even no sensor on the ir sensor, i already try trouble shoot but none i can get where did i got wrong, can i get help from any expert from AAC..?

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