This is pdfTeX, Version 3.14159265-2.6-1.40.18 (TeX Live 2017/TeX Live for SUSE Linux) (preloaded format=pdflatex 2020.8.24) 31 MAR 2021 16:10 entering extended mode restricted \write18 enabled. %&-line parsing enabled. **conclusion.tex (./conclusion.tex LaTeX2e <2017-04-15> Babel <3.10> and hyphenation patterns for 84 language(s) loaded. ! LaTeX Error: Missing \begin{document}. See the LaTeX manual or LaTeX Companion for explanation. Type H for immediate help. ... l.3 s adsad You're in trouble here. Try typing to proceed. If that doesn't work, type X to quit. Missing character: There is no s in font nullfont! Missing character: There is no a in font nullfont! Missing character: There is no d in font nullfont! Missing character: There is no s in font nullfont! Missing character: There is no a in font nullfont! Missing character: There is no d in font nullfont! ) ! Emergency stop. <*> conclusion.tex *** (job aborted, no legal \end found) Here is how much of TeX's memory you used: 5 strings out of 492995 163 string characters out of 6141053 54074 words of memory out of 5000000 3658 multiletter control sequences out of 15000+600000 3640 words of font info for 14 fonts, out of 8000000 for 9000 1141 hyphenation exceptions out of 8191 5i,0n,4p,43b,14s stack positions out of 5000i,500n,10000p,200000b,80000s ! ==> Fatal error occurred, no output PDF file produced!