I can't delete an image

Pixoto score of 446.  Image has not won any awards.  I would like to delete.  
Here is the URL for the image:  
https://www.pixoto.com/images-photography/nature-up-close/trees-and-bushes/on-my-way-to-work-4830561301561344

Here is the message that appears when I hover on the greyed out delete button. 
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