ApexSQL Doc - Trying to document an SSIS package but after generating the report, it's empty

I select "Integration services" in the left-hand pane (Data sources and objects). Then when I select "+ Add" I get the following warning msg: Integration services are not installed". I click OK and then the "Add integrations services packages" window pops up. I select "Package files or file system" for the "Location" and then select the "Add folder" icon (or I select the "Add" icon and add the packages individually). I then choose the report details, and then I click the "Generate" icon. It seems to be parsing the package but when I view the report it's empty. Anyone else having this issue?