This is pdfTeX, Version 3.14159265-2.6-1.40.18 (TeX Live 2017/W32TeX) (preloaded format=pdflatex 2018.3.30) 26 DEC 2018 16:40 entering extended mode restricted \write18 enabled. %&-line parsing enabled. **./parent.tex (./parent.tex LaTeX2e <2017-04-15> Babel <3.10> and hyphenation patterns for 84 language(s) loaded. (/TexLive/texmf-dist/tex/latex/base/article.cls Document Class: article 2014/09/29 v1.4h Standard LaTeX document class (/TexLive/texmf-dist/tex/latex/base/size10.clo File: size10.clo 2014/09/29 v1.4h Standard LaTeX file (size option) ) \c@part=\count79 \c@section=\count80 \c@subsection=\count81 \c@subsubsection=\count82 \c@paragraph=\count83 \c@subparagraph=\count84 \c@figure=\count85 \c@table=\count86 \abovecaptionskip=\skip41 \belowcaptionskip=\skip42 \bibindent=\dimen102 ) (/TexLive/texmf-dist/tex/generic/babel/babel.sty Package: babel 2017/05/19 3.10 The Babel package ! Package babel Error: Unknown option `foo'. Either you misspelled it (babel) or the language definition file foo.ldf was not found. See the babel package documentation for explanation. Type H for immediate help. ... l.393 \ProcessOptions* Valid options are: shorthands=, KeepShorthandsActive, activeacute, activegrave, noconfigs, safe=, main=, math= headfoot=, strings=, config=, hyphenmap=, or a language name. ! Package babel Error: You haven't specified a language option. See the babel package documentation for explanation. Type H for immediate help. ... l.426 ...ry to proceed from here, type x to quit.} You need to specify a language, either as a global option or as an optional argument to the \usepackage command; You shouldn't try to proceed from here, type x to quit. ) (./parent.aux) \openout1 = `parent.aux'. LaTeX Font Info: Checking defaults for OML/cmm/m/it on input line 5. LaTeX Font Info: ... okay on input line 5. LaTeX Font Info: Checking defaults for T1/cmr/m/n on input line 5. LaTeX Font Info: ... okay on input line 5. LaTeX Font Info: Checking defaults for OT1/cmr/m/n on input line 5. LaTeX Font Info: ... okay on input line 5. LaTeX Font Info: Checking defaults for OMS/cmsy/m/n on input line 5. LaTeX Font Info: ... okay on input line 5. LaTeX Font Info: Checking defaults for OMX/cmex/m/n on input line 5. LaTeX Font Info: ... okay on input line 5. LaTeX Font Info: Checking defaults for U/cmr/m/n on input line 5. LaTeX Font Info: ... okay on input line 5. (./parent.aux) ) Here is how much of TeX's memory you used: 304 strings out of 492995 3421 string characters out of 6138727 56035 words of memory out of 5000000 3938 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 23i,1n,17p,116b,36s stack positions out of 5000i,500n,10000p,200000b,80000s No pages of output. PDF statistics: 0 PDF objects out of 1000 (max. 8388607) 0 named destinations out of 1000 (max. 500000) 1 words of extra memory for PDF output out of 10000 (max. 10000000)