I am using putpdf to save 2 .png files into one pdf document.

Code:

putpdf begin

putpdf paragraph
putpdf image enrollage.png
putpdf image agedensity.png

cd $final_graph
//changing directory to where the final pdf will be saved
putpdf save study_graphs.pdf
putpdf clear

At the point of "putpdf save" I get error r(198) which says "failed to add paragraph."

I'm not trying to add a paragraph at this point in the code, I'm trying to save the pdf I've built-- why did this error show up and how can I fix it?