This issue might be related to Photoshop's “Slices” settings. Following these steps should help:

  • Draw a slice in your artboard.

  • Select “Save for Web” from the menu “File > Export” up top and click “Save”.

  • Select the “All Slices” option.

After following these steps, you can delete the slice you just created and you should now be able to export the file.

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