ADOBE IN DESIGN

HI,

Got some html links as copy in my document and apparently now I can't print or export directly to pdf because it flags up the bellow. 

On every attemp. even when backsaving as an IDML it will categorically refuse to export as a PDF and prints despite telling me it can't in IDML format. I've had to export as Jpeg to combine in ADOBE PDF.

I'm not sure what's gooing on but the last 6 months In Design has become increasingly unstable.