This is pdfTeX, Version 3.14159265-2.6-1.40.19 (MiKTeX 2.9.6730 64-bit) (preloaded format=pdflatex 2018.7.26)  28 JUL 2018 10:05
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**./04_Results.tex
(04_Results.tex
LaTeX2e <2018-04-01> patch level 5
! Undefined control sequence.
l.1 \section
            {Experimental setup of the $\mu \rightarrow eee$-experiment}
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.


! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.1 \section{E
              xperimental setup of the $\mu \rightarrow eee$-experiment}
You're in trouble here.  Try typing  <return>  to proceed.
If that doesn't work, type  X <return>  to quit.

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)
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<*> ./04_Results.tex
                    
*** (job aborted, no legal \end found)

 
Here is how much of TeX's memory you used:
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!  ==> Fatal error occurred, no output PDF file produced!