is reporting something pretty fundamental (document base font size not set up). While this can, as the message implies, be due to a broken class file, the more common cause is that you have simply forgotten to put aThe font size command \normalsize is not defined: there is probably something wrong with the class file.
documentclasscommand in your document.
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URL for this question: http://www.tex.ac.uk/cgi-bin/texfaq2html?label=normalszmiss
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This is FAQ version 3.27, released on 2013-06-07.