mPDF error: IMAGE Error (https://www.openspace.org.il/wp-content/uploads/2017/11/logo.png): Failed to create temporary image file (/home/openspaceorg/public_html/wp-content/themes/Avada-Child-Theme/mpdf60/tmp/_tempMskPNG36bfb6938bf70c3e3524d112fb48c8cd9159.png) parsing PNG image with alpha channel (alpha channel)