I assume you are using File::Copy?

You say you checked the existance of $GraphicsDirectory - are you sure the source is the problem? Could it be that the non-existant part is $pparent/$path/images/$line?

Can you put a statement like

print "<$GraphicsDirectory><$line><$pparent/$path/images/$line>\n";
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in your loop and see if it returns reasonable values?

The < and > are there so you can tell if any of the values are empty and where each variable begins and ends.