Cropbox does not equal Mediabox

What are the cropbox and the mediabox?
	The cropbox and mediabox are instructions built into a file to tell the software or printer where boundaries lie between different areas. When these areas don’t match up in a file, our printer is unable to interpret it properly.

How to fix this error
	Resaving the file with our standard preflight settings will reset the cropbox and mediabox sizes, therefore fixing the issue. Here is how to preflight the file from Adobe Illustrator or Photoshop:
	Open the file in the relevant program. Click File > Save As. Select Adobe PDF as the file format. The Adobe PDF Preset menu will then pop-up - select [PDF/X-1a:2001] from the dropdown. Click Save PDF.

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What are the cropbox and the mediabox?