HELP - error to save to pdf - file not opening

Hi, I am new to Corel and struggling to save my file in Corel Home & Student 2018 V20.0.0.663 to a PDF file. When I try to open my PDF file the error message - (an error exists on this page. Acrobat may not display the page correctly. Please contact he person who created the PDF document to correct the problem.

Can someone please help me or explain what I am doing wrong.

Thank you so much