mlreportge​n.ppt.Pres​entation/a​dd failed to copy file

I am trying to use mlreportgen.ppt to create a Powerpoint. However, when I used the command "pictureSlide = add(slides,'Title and Content');", I get the following error: "Error using mlreportgen.ppt.Presentation/add Failed to copy file". I have not been able to find any information regarding this error. Any ideas?

[Sean de Wolski]

Can you provide the full script leading up to this point?