What could be causing thick black diagonal line in front of my sensor & photos?

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ICantPhotographMaybe New Member • Posts: 1
What could be causing thick black diagonal line in front of my sensor & photos?

I have a Canon EOS Rebel XTi

On every photo I take I have a thick diagonal black line appear on the photograph. See an example picture: https://imgur.com/a/pURaYPO

My next discovery came when I selected "Sensor Cleaning: Manual" in the camera options which makes the mirror move up and out of the way of the sensor. I then took a picture looking at the sensor. There is a thick plastic thing in the way of the sensor. Here is a picture: https://imgur.com/a/sTEBYbZ

Does anyone know what this plastic thing in front of the sensor is? It is still attached to the camera so I cannot pull it out.

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