This is pdfTeX, Version 3.1415926-1.40.10 (MiKTeX 2.8) (preloaded format=pdflatex 2011.10.22) 1 FEB 2012 18:53 entering extended mode **P:/NEXT/pv_tdr2/PressureVessel.tex (P:/NEXT/pv_tdr2/PressureVessel.tex LaTeX2e <2009/09/24> Babel and hyphenation patterns for english, dumylang, nohyphenation, ge rman, ngerman, german-x-2009-06-19, ngerman-x-2009-06-19, french, loaded. ! LaTeX Error: Missing \begin{document}. See the LaTeX manual or LaTeX Companion for explanation. Type H for immediate help. ... l.1 T he pressure vessel (PV) consists of a cylindrical main section with two... ? ! Emergency stop. ... l.1 T he pressure vessel (PV) consists of a cylindrical main section with two... You're in trouble here. Try typing to proceed. If that doesn't work, type X to quit. Here is how much of TeX's memory you used: 8 strings out of 495285 303 string characters out of 3180279 45037 words of memory out of 3000000 3306 multiletter control sequences out of 15000+200000 3640 words of font info for 14 fonts, out of 3000000 for 9000 14 hyphenation exceptions out of 8191 5i,0n,4p,602b,14s stack positions out of 5000i,500n,10000p,200000b,50000s ! ==> Fatal error occurred, no output PDF file produced!