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The frontespizio package typesets a frontispiece in a style suitable for a thesis at an Italian university. It produces the frontispiece as a separate PDF, which is then included back into the main project. This means that a special compile step is required, in order to build the frontispiece. To achieve this on Overleaf, you can use \write18 to start the compile, like this:

\begin{frontespizio} 
\Istituzione{Politecnico di Torino}
% ... your other information here
\end{frontespizio}
\IfFileExists{\jobname-frn.pdf}{}{%
\immediate\write18{pdflatex \jobname-frn}}

If the compile of the frontispiece fails, you can use the listings package and then put

\lstinputlisting{main-frn.log}

after the code above to get the log file into your main project, where you can read it and find the issue.