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I'm using TeXlipse (LaTeX plugin for eclipse) and I want to preview my LaTeX document.

I have configured yap in the viewer settings.
When I push the preview button I get an error in the console:

Error: Project output file format not set in project: thesis.

I don't understand the message, because I set the output file and it works, because when I save, the auto save compile function produces the correct output pdf

Here is my .texlipse file

#TeXlipse project settings
#Thu Jun 21 20:51:48 CEST 2012

and my .project file

<?xml version="1.0" encoding="UTF-8"?>
            <location>C:/Program Files (x86)/MiKTeX 2.9/tex/latex/tools/.tex</location>
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migrated from Jun 22 '12 at 17:23

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1 Answer 1

YAP is a DVI viewer, not a PDF viewer. Therefore it cannot open your PDF file, as the error message informs you:

enter image description here

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