• Please use code tags to show your code : see Writeup Formatting Tips
  Update: O.P has since done this. Thanks.
• Please use strict; - that would have pointed out your error (below)
• $Slide is different from $slide. In your code, $Slide is not defined.

FYI, your "while ($i < 5)" loop can be written more idiomatically thus:

for (my $i = 1; $i < 5; $i++) {
        $slide = $ppt->Slides->Add($i, ppLayoutBlank);
    }
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