Doubt regarding the PYNQ

PYNQ Version: PYNQ V2.0 image
Board Name: PYNQ Z1 board
Tool Version: Viavdo 2018.1

Actually I am very new to this pynq board and hardware implementation. I have created the block design and generated the bitstream in vivado and created an overlay in jupyter notebook of pynq, when I run the output cell I am getting all zeros as output.

Can you please help me where I am going wrong.
I have attached my block design and my jupyter notebook file below.

newpd_bd_modified.pdf (100.5 KB)

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