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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 stackoverflow.com Jun 22 '12 at 17:23

This question came from our site for professional and enthusiast programmers.

Welcome to TeX.sx! Your question was migrated here from Stack Overflow. Please register on this site, too, and make sure that both accounts are associated with each other (by using the same OpenID), otherwise you won't be able to comment on or accept answers or edit your question. – Werner Jun 22 '12 at 17:32

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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