Acrobat Reader error message

Hi,

For some of our courses we have certificate at the end and learners will then right click > print > save as pdf for their copy. However now we see an error message that says "An error exists on this page. Acrobat may not display the page correctly. Please contact the person who created the PDF document to correct the problem". Has anyone experienced this... is there any workaround to this? Thanks. 

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