This is pdfTeX, Version 3.1415926-2.3-1.40.12 (TeX Live 2011) (format=pdflatex 2012.5.6) 6 MAY 2012 16:49 entering extended mode \write18 enabled. %&-line parsing enabled. **backgrounds.tex (./backgrounds.tex LaTeX2e <2009/09/24> Babel and hyphenation patterns for english, dumylang, nohyphenation, ge rman-x-2009-06-19, ngerman-x-2009-06-19, afrikaans, ancientgreek, ibycus, arabi c, armenian, basque, bulgarian, catalan, pinyin, coptic, croatian, czech, danis h, dutch, ukenglish, usenglishmax, esperanto, estonian, ethiopic, farsi, finnis h, french, galician, german, ngerman, swissgerman, monogreek, greek, hungarian, icelandic, assamese, bengali, gujarati, hindi, kannada, malayalam, marathi, or iya, panjabi, tamil, telugu, indonesian, interlingua, irish, italian, kurmanji, lao, latin, latvian, lithuanian, mongolian, mongolianlmc, bokmal, nynorsk, pol ish, portuguese, romanian, russian, sanskrit, serbian, serbianc, slovak, sloven ian, spanish, swedish, turkish, turkmen, ukrainian, uppersorbian, welsh, loaded . ! Undefined control sequence. l.1 \section {Background Estimation} ? ! Emergency stop. l.1 \section {Background Estimation} End of file on the terminal! Here is how much of TeX's memory you used: 5 strings out of 493633 142 string characters out of 3143378 49245 words of memory out of 3000000 3405 multiletter control sequences out of 15000+200000 3640 words of font info for 14 fonts, out of 3000000 for 9000 831 hyphenation exceptions out of 8191 5i,0n,1p,49b,8s stack positions out of 5000i,500n,10000p,200000b,50000s ! ==> Fatal error occurred, no output PDF file produced!