Přeložení dokumentu se nezdařilo. (pdflatex error 12)

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This is pdfTeX, Version 3.141592653-2.6-1.40.26 (TeX Live 2024/Arch Linux) (preloaded format=pdflatex 2024.6.2)  9 SEP 2024 21:13
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**01DIFRcviceni_Header_3c0c3d32.tex
(./01DIFRcviceni_Header_3c0c3d32.tex
LaTeX2e <2023-11-01> patch level 1
L3 programming layer <2024-02-20>
(./header.tex (/usr/share/texmf-dist/tex/latex/base/article.cls
Document Class: article 2023/05/17 v1.4n Standard LaTeX document class
(/usr/share/texmf-dist/tex/latex/base/size12.clo
File: size12.clo 2023/05/17 v1.4n Standard LaTeX file (size option)
)
\c@part=\count188
\c@section=\count189
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\abovecaptionskip=\skip48
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) (/usr/share/texmf-dist/tex/latex/base/inputenc.sty
Package: inputenc 2021/02/14 v1.3d Input encoding file
\inpenc@prehook=\toks17
\inpenc@posthook=\toks18
) (/usr/share/texmf-dist/tex/generic/babel/babel.sty
Package: babel 2024/02/07 v24.2 The Babel package
\babel@savecnt=\count196
\U@D=\dimen141
\l@unhyphenated=\language7
(/usr/share/texmf-dist/tex/generic/babel/txtbabel.def)
\bbl@readstream=\read2
\bbl@dirlevel=\count197
(/usr/share/texmf-dist/tex/generic/babel-czech/czech.ldf
Language: czech 2008/07/06 v3.1a Czech support from the babel system
Package babel Info: Making " an active character on input line 172.
\cs@wordlen=\count198
Package babel Info: Making - an active character on input line 226.
)) (/usr/share/texmf-dist/tex/generic/babel/locale/cs/babel-czech.tex
Package babel Info: Importing font and identification data for czech
(babel)             from babel-cs.ini. Reported on input line 11.
)) (/usr/share/texmf-dist/tex/latex/l3backend/l3backend-pdftex.def
File: l3backend-pdftex.def 2024-02-20 L3 backend support: PDF output (pdfTeX)
\l__color_backend_stack_int=\count199
\l__pdf_internal_box=\box51
) (./01DIFRcviceni_Header_3c0c3d32.aux)
\openout1 = `01DIFRcviceni_Header_3c0c3d32.aux'.

LaTeX Font Info:    Checking defaults for OML/cmm/m/it on input line 2.
LaTeX Font Info:    ... okay on input line 2.
LaTeX Font Info:    Checking defaults for OMS/cmsy/m/n on input line 2.
LaTeX Font Info:    ... okay on input line 2.
LaTeX Font Info:    Checking defaults for OT1/cmr/m/n on input line 2.
LaTeX Font Info:    ... okay on input line 2.
LaTeX Font Info:    Checking defaults for T1/cmr/m/n on input line 2.
LaTeX Font Info:    ... okay on input line 2.
LaTeX Font Info:    Checking defaults for TS1/cmr/m/n on input line 2.
LaTeX Font Info:    ... okay on input line 2.
LaTeX Font Info:    Checking defaults for OMX/cmex/m/n on input line 2.
LaTeX Font Info:    ... okay on input line 2.
LaTeX Font Info:    Checking defaults for U/cmr/m/n on input line 2.
LaTeX Font Info:    ... okay on input line 2.

! LaTeX Error: Can be used only in preamble.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.4 \documentclass
                  [12pt]{article}
Your command was ignored.
Type  I <command> <return>  to replace it with another command,
or  <return>  to continue without it.


! LaTeX Error: Can be used only in preamble.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.5 \usepackage
               [utf8]{inputenc}
Your command was ignored.
Type  I <command> <return>  to replace it with another command,
or  <return>  to continue without it.


! LaTeX Error: Can be used only in preamble.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.6 \usepackage
               [czech]{babel}
Your command was ignored.
Type  I <command> <return>  to replace it with another command,
or  <return>  to continue without it.

[1

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0c3d32.aux)
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LaTeX2e <2023-11-01> patch level 1
L3 programming layer <2024-02-20>
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Here is how much of TeX's memory you used:
 1607 strings out of 476042
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Output written on 01DIFRcviceni_Header_3c0c3d32.pdf (1 page, 11967 bytes).
PDF statistics:
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 1 words of extra memory for PDF output out of 10000 (max. 10000000)