problems with finger scanner

I bought a KOOKYE Optical Fingerprint Reader Sensor Module Locks All-in-one For Arduino R3 this is the first time I have tried any thing like this as its my college project. I am using a mega 2560, I have contacted the finger scanner to the board like your video in this link https://www.youtube.com/watch?v=1diFaa5OsFg . The scanner flickers green for second then off and there no other lights showing on the scanner. I then down loaded the library and then done the enrolling and then it say no finger scanner found like in the pictures below.

https://i.imgur.com/hA56VGl.png

https://i.imgur.com/y8h6oUG.png

Do you think it might be helpful if you posted your code ?

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