When building a document in your layout application it is important to make sure it is prepared correctly. Here is a check list of items to review before creating your final PDFs.
If you have made sure the above are accurate to your desired outcome, the next step is to open the page in Smart Review, then open the Preflight Manager 
Review the information in the Preflight Manager dialo box. Pay extra attention to any Warnings or Errors and the information listed next to them.