cant get upload to work - am i stupid?

i would like to use the slideshare api to upload a ppt file on demand.. but i keep getting the following error message:
<slideshareserviceerror>
<message>6: Slideshow file is not a source object</message>
</slideshareserviceerror>

Here is the URL i am trying (obviously replaced certain details!)

http://www.slideshare.net/api/1/uploa...

If anyone can help me that would be great.
 
sad I’m frustrated
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