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For example, when I download the ShowcaseCircular.tex file from here, I can see it previewed on the PDF viewer. But when I try pp.tex, I get some kind of error on TeXworks. Why is that?

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up vote 7 down vote accepted

There are several format to compile the LaTeX code. ShowcaseCircular.tex compiles with pdflatex, while pp.tex compiles with context. You have to choose the appropriate compilation format for the right TeX file.

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