Some elements on the page have been drawn partly or entirely outside the printable area of the page.
If you wish to find out which items are involved then click one of the View | Unprintable Area options or View | Whole Page. Note that the offending element might be text, line, shading or graphics and could even be white, in which case it would not normally be visible. If you select an area by dragging the mouse, any white elements will become visible against the blue background of the selected area. Note that merely lowering the pen in HP-GL mode causes a dot to be printed and whilst this may not be easy to see it can cause this problem to be signaled. The presence of this problem does not therefore necessarily mean that the result of converting the image will be incorrect even though some items may not be included in the output.