I'm getting the following error, trying to generate a pdfset.

{"type":"error.SuiteScriptError","name":"USER_ERROR","message":"Error Parsing XML: //system.na3.netsuite.com/core/media/media.nl?id=6788718&c=1272308&h=222d1bd0da24f11f2bbc&_xt=.pdf", ...

I'm confused because I've been able to send in urls with ampersands in other templates which generate a pdf instead of a pdfset. Anyone know why?