Error producing PDF Reports and Figures from Script files?

1) I keep getting the following error(s) when trying to produce a "PDF" report (1.1-(rptgen.utils.FOPProxy, fop = newFOPImpl(h, fopOutputStream, basePath, locale, extraFonts)and also (1.2-(rptgen.utils.FOPProxy, foToPDFImpl(h, foPath, pdfPath, locale, extraFonts, cleanupFonts). I also get another error with (1.3-(close(rpt)). This seems to happen only for PDF's but not HTML, any ideas anyone?

2) I'm lost for producing figures in my report where and how do I reference my figure/plot? I have 2 plots on the same graph/figure let's say (h1 and h2). Do I reference it as fig=figure(h1,h2) and does the code fit into the section classes respectively? I'm a little unclear on how to organise the report (ch, fig, sect) etc

My current version is R2017b.

Cheers, Frank