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Error creating thumbnail: convert: unable to open image `/var/www/wiki/images/7/7e/PD-icon.png': @ error/blob.c/OpenBlob/2590.
convert: unable to open file `/var/www/wiki/images/7/7e/PD-icon.png' @ error/png.c/ReadPNGImage/3244.
convert: missing an image filename `/tmp/transform_2decab0-1.png' @ error/convert.c/ConvertImageCommand/3011.
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