This is pdfTeX, Version 3.1415926-2.3-1.40.12 (TeX Live 2011) (format=pdflatex 2011.7.3) 20 FEB 2012 22:20 entering extended mode \write18 enabled. file:line:error style messages enabled. %&-line parsing enabled. **H1T7.tex (./H1T7.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 . ./H1T7.tex:1: LaTeX Error: Environment Tehtava undefined. See the LaTeX manual or LaTeX Companion for explanation. Type H for immediate help. ... l.1 \begin{Tehtava} ? ./H1T7.tex:1: Emergency stop. ... l.1 \begin{Tehtava} Your command was ignored. Type I to replace it with another command, or to continue without it. Here is how much of TeX's memory you used: 7 strings out of 493633 259 string characters out of 3143378 49245 words of memory out of 3000000 3406 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,4p,34b,16s stack positions out of 5000i,500n,10000p,200000b,50000s ./H1T7.tex:1: ==> Fatal error occurred, no output PDF file produced!