The file "instructions/bsc_english_contents.tex" refers to a non-existent file
On 309 in instructions/bsc_english_contents.tex
is a reference to a non-existing file, namely kuvaesimerkki.pdf
(lines 302-314 quoted below for your convenience).
The image~\ref{kuvaesimerkki} shows how to present a figure. You must pay attention to the visibility of
figure parts and text, to the numbering of figures, and captions.
\begin{figure}[ht]
%\begin{figure}[tbh] t= top, b = bottom, h=here
\ \newline
\begin{center}
\includegraphics[width=0.9\textwidth]{kuvaesimerkki.pdf}
%\rotatebox{90}{\includegraphics[scale=.75]{kuvaesimerkki.pdf}}
\caption{Figure elements.}
\label{kuvaesimerkki}
\end{center}
\end{figure}