file_managed

Duplicate entry for key 'uri'

This problem happens when you are trying to upload an image or download an image from youtube or similar sites. To solve this problem we need to edit your mysql database using phpmysql or manually.
Navigate to file_managed table, go to the last row by clicking the double arrow and delete last entry. It will usually say something like temporary default.jpg or something like that, delete this entry and should be able to upload images again.

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