When I view a survey's results, go to Consolidated Report, and click on the PDF export, it downloads a "report.pdf" file that is 1Kb everytime no matter what survey I'm exporting from, and when I try to open the PDF it says it is damaged.

Community Surveys v4.2.3
CjLib Component v2.5.0
Joomla v3.6.4

Any suggestions what may be going on?

Thanks.