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This problem looks like it's not had a clear solution as yet. I have installed a clean version of WordPress via SSH with folder permissions set to 755 and file permissions to 644.
I have no problem uploading images, updated plugins etc, but when it comes to editing an image I receive this error:
WP_DEBUG shows nothing, and there are no other errors on the website.
561
The most likely reason is not having mod-gd installed.
WordPress uses the GD Graphic Library to manipulate images (see wp-admin/includes/image.php), and this error appears when it is not installed.
It can also be caused by whitespace introduced somewhere. Check for any php closing tags ?> and remove them. They should not be used because whitespace can be introduced after them.
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answered Oct 14 '25 16:10
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