! Undefined control sequence.\UseRawInputEncoding ...tencodingname \@undefined\let \DeclareFontEncoding@

Question

I have a huge document using lots of packages, I use \include{chapter} to make it manageable and I don't have a clue where the error can come from, so I don't really know how to make a MWE.

When this error appeared I undid all the changes I did in the chapter (which is separate file) since the last compilation and the error persists. These changes were mainly adding citations (`\parencite{citation}'). The error persists if I compile other chapters without eliminating all the auxiliary files; if I eliminate them, the other chapters compile fine. So I guess the error must be in the preamble of the main file although I didn't make any change, at least not on purpose. If I use overleaf to compile the document, it gives me the same error also only compiling the same chapter, so the problem should not come because of any missing upgrade (I upgraded MikTek anyway). The error points to a row of the chapter where there is no code (if I comment the code around the error, the error persists) and it doesn't tell me what it is that Latex does not understand, so I don't know where to search.

This is the preamble (sorry I don't know what to keep for the MWE):

\documentclass[11pt, a4paper, oneside]{report}
%-----------------Packages used-----------------------
\usepackage[utf8]{inputenc} % which type of code to use to input special characters and accepts accents!
\usepackage[T1]{fontenc} % better fonts, less problems with copy-paste with accents, straight quotes
\usepackage{chngcntr} % to be able to change the numbering "depth"
    \counterwithin{figure}{subsection} % make figures show subsection number
    \counterwithin{table}{subsection} % make tables show subsection number
\usepackage{blindtext}
\usepackage{enumitem} % To control enumerate style
\usepackage{graphicx} % for managing the graphics
    \graphicspath{{images/}} % for 'graphicx' to know where the images are
\usepackage{rotating} % to allow sideways figures ¿and tables? (rotated 90º)
\usepackage{caption} % to use \captionof{figure}{Test figure.} which in minitap allows figures and equations side by side
\usepackage[left=4cm,right=2cm,top=2.5cm,bottom=2.5cm]{geometry} % control the geometry of the page
\usepackage[backend=biber, style=apa]{biblatex}
    \addbibresource{bibliography/Institutions.bib}
    \addbibresource{bibliography/Thesis.bib}
%\bibliographystyle{unsrt}
\usepackage{fancyhdr} % to have and control headers and fooders
\pagestyle{fancy}
%\fancyhead{}  % These and the two next come from the Annual review
%\fancyhead[L]{\ttl}
%\fancyhead[R]{\nom}
\usepackage{setspace} % to control the space between lines
    \onehalfspacing % for package 'setspace' to set 1.5 space between lines (from setspace)
\usepackage{amsmath} % More options for writing equations
\usepackage{amssymb} % access to many symbols, check (tick) symbol
\usepackage{ragged2e}
%%%%%% TABLES %%%%%%%
\usepackage{booktabs} % nicer tables stuff
\usepackage{array} % More options for tables
    \newcolumntype{B}[1]{>{\centering\arraybackslash}b{#1}} % to be able to center (bottom) content of cells with defined width
\usepackage{multirow} % Allows cells to spand in multiple rows.
\usepackage[table]{xcolor} % Allows rows to be coloured
\usepackage{tabularx} % To be able to adjust the total width of the table
%\newcolumntype{b}{X} % For wider columns
    \newcolumntype{s}{>{\hsize=.6\hsize}X} % For narrower columns of indicators
    \newcolumntype{S}{>{\hsize=1.1\hsize}X} % For narrower columns
    \newcolumntype{a}{>{\hsize=.35\hsize}X} % For narrower columns of indicators
    \newcolumntype{A}{>{\hsize=1.85\hsize}X} % For narrower columns
    \newcolumntype{L}[1]{>{\RaggedRight\hsize=#1\hsize\linewidth=\hsize}X}
\usepackage{makecell} % You can make a cell with various text lines: \makecell{line1\line2}
\usepackage{pdflscape}
\usepackage{longtable}
\usepackage{xltabular} % long tabularx
%\usepackage{tabulary} % automatic column widths
%%%%%%%%%%%%%%%%%%%%%%
\usepackage{float} % To be able to use H in figures (H tells latex to put the figure exactly where the code is
\usepackage{color,soul} % To be able to highlight or make coloured text
\usepackage{afterpage} % To be able to force an image to be in the next page instead of in Cuenca
\usepackage{pdfpages} % To be able to include .pdf's, see: https://tex.stackexchange.com/questions/440005/includepdf-jumps-to-new-page-can-i-avoid-that
\usepackage{ragged2e} % To be able to use \justify and other
\sethlcolor{olive}
\DeclareRobustCommand{\hlr}[1]{{\sethlcolor{red}\hl{#1}}}
\DeclareRobustCommand{\hlp}[1]{{\sethlcolor{pink}\hl{#1}}}



\usepackage[all]{nowidow}
\usepackage{textcomp} % access \textquotesingle
\usepackage{hyperref}
%--------- What is compiled? -------------------------
\includeonly{
%   titlepage,
%   abstract,
%   chapters/chapter1,
%   chapters/chapter2,
%   chapters/chapter3,
    chapters/chapter4,
%   chapters/chapter5,
%   chapters/chapter6,
%   chapters/chapter7,
%   chapters/chapter8,
%   chapters/chapter9,
%   chapters/appendix0,
%   chapters/appendix00,
%   chapters/appendix1,
%   chapters/appendix2
}

I wanted to include all the log file but the text is too long and I cannot paste it here. I think this is the part related to the error:

[220]
! Undefined control sequence.
\UseRawInputEncoding ...tencodingname \@undefined 
                                                  \let \DeclareFontEncoding@...
l.342
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'), typeI' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
! Missing \endcsname inserted.
<to be read again> 
                   \let 
l.342
The control sequence marked <to be read again> should
not appear between \csname and \endcsname.
! Missing \endcsname inserted.
<to be read again> 
                   \let 
l.342
The control sequence marked <to be read again> should
not appear between \csname and \endcsname.
! Missing \endcsname inserted.
<to be read again> 
                   \let 
l.342
The control sequence marked <to be read again> should
not appear between \csname and \endcsname.
! Undefined control sequence.
<argument> @undefined
l.342
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'), typeI' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
! Undefined control sequence.
\UseRawInputEncoding ...tencodingname @undefined 
                                                  \let \DeclareFontEncoding@...
l.342
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'), typeI' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
! Missing \endcsname inserted.
<to be read again> 
                   \let 
l.342
The control sequence marked <to be read again> should
not appear between \csname and \endcsname.
! Missing \endcsname inserted.
<to be read again> 
                   \let 
l.342
The control sequence marked <to be read again> should
not appear between \csname and \endcsname.
! Missing \endcsname inserted.
<to be read again> 
                   \let 
l.342
The control sequence marked <to be read again> should
not appear between \csname and \endcsname.
! Undefined control sequence.
<argument> @undefined
l.342
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'), typeI' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
! Package inputenc Error: Unicode character € (U+0080)
(inputenc)                not set up for use with LaTeX.
See the inputenc package documentation for explanation.
Type  H <return>  for immediate help.
 ...
l.342
You may provide a definition with
\DeclareUnicodeCharacter
! Undefined control sequence.
<argument> ...ont encoding \let }\global \def \T@ 
                                                  \let \endcsname {\protect ...
l.342
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'), typeI' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
! Undefined control sequence.
<argument> ...tinue without it.}}\global \def \M@ 
                                                  \let \endcsname {\def 7{7}...
l.342
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'), typeI' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
! Package inputenc Error: Invalid UTF-8 byte "9C.
See the inputenc package documentation for explanation.
Type  H <return>  for immediate help.
 ...
l.342
The document does not appear to be in UTF-8 encoding.
Try adding \let utf8\let \GenericError {               }{LaTeX Error: Can be us
ed only in preamble}{See the LaTeX manual or LaTeX Companion for explanation.}{
Your command was ignored.
Type  I <command> <return>  to replace it with another command,
or  <return>  to continue without it.}\GenericInfo {(Font)              }{LaTeX
 Font Info:    Redeclaring font encoding \let }\global \def \let \endcsname {\G
enericError {               }{LaTeX Error: Can be used only in preamble}{See th
e LaTeX manual or LaTeX Companion for explanation.}{Your command was ignored.
Type  I <command> <return>  to replace it with another command,
or  <return>  to continue without it.}}\global \def \let \endcsname {\def 7{7}}
\xdef PD1{\let }@tempcnta =1 \def \iterate {\catcode @tempcnta =15 \advance 

@tempcnta @ne }\iterate \let \iterate \relax \catcode 0=15 \catcode 9=10 \catc
ode 10=12 \catcode 12=13 \catcode 13=5 @tempcnta =128 \def \iterate {\catcode 
@tempcnta =12 \advance @tempcnta @ne }\iterate \let \iterate \relax as the f
irst line of the file
or specify an encoding such as \GenericError {               }{LaTeX Error: Can
 be used only in preamble}{See the LaTeX manual or LaTeX Companion for explanat
ion.}{Your command was ignored.
Type  I <command> <return>  to replace it with another command,
or  <return>  to continue without it.}[latin1]{inputenc}
in the document preamble.
Alternatively, save the file in UTF-8 using your editor or another tool
! Package inputenc Error: Unicode character € (U+0080)
(inputenc)                not set up for use with LaTeX.
See the inputenc package documentation for explanation.
Type  H <return>  for immediate help.
 ...
l.342
You may provide a definition with
\DeclareUnicodeCharacter
! Undefined control sequence.
<argument> ...ont encoding \let }\global \def \T@ 
                                                  \let \endcsname {\protect ...
l.342
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'), typeI' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
! Undefined control sequence.
<argument> ...tinue without it.}}\global \def \M@ 
                                                  \let \endcsname {\def 7{7}...
l.342
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'), typeI' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
! Package inputenc Error: Invalid UTF-8 byte "9D.
See the inputenc package documentation for explanation.
Type  H <return>  for immediate help.
 ...
l.342
The document does not appear to be in UTF-8 encoding.
Try adding \let utf8\let \GenericError {               }{LaTeX Error: Can be us
ed only in preamble}{See the LaTeX manual or LaTeX Companion for explanation.}{
Your command was ignored.
Type  I <command> <return>  to replace it with another command,
or  <return>  to continue without it.}\GenericInfo {(Font)              }{LaTeX
 Font Info:    Redeclaring font encoding \let }\global \def \let \endcsname {\G
enericError {               }{LaTeX Error: Can be used only in preamble}{See th
e LaTeX manual or LaTeX Companion for explanation.}{Your command was ignored.
Type  I <command> <return>  to replace it with another command,
or  <return>  to continue without it.}}\global \def \let \endcsname {\def 7{7}}
\xdef PD1{\let }@tempcnta =1 \def \iterate {\catcode @tempcnta =15 \advance 

@tempcnta @ne }\iterate \let \iterate \relax \catcode 0=15 \catcode 9=10 \catc
ode 10=12 \catcode 12=13 \catcode 13=5 @tempcnta =128 \def \iterate {\catcode 
@tempcnta =12 \advance @tempcnta @ne }\iterate \let \iterate \relax as the f
irst line of the file
or specify an encoding such as \GenericError {               }{LaTeX Error: Can
 be used only in preamble}{See the LaTeX manual or LaTeX Companion for explanat
ion.}{Your command was ignored.
Type  I <command> <return>  to replace it with another command,
or  <return>  to continue without it.}[latin1]{inputenc}
in the document preamble.
Alternatively, save the file in UTF-8 using your editor or another tool
[221] [222] [223
]
Appendix E.
[273
]

---

EDIT: The error disappears if I comment \printbibliography, so it must be something related to this command. But it doesn't make any sense as it was working fine before, for other chapters (separate files) as well as for the same chapter.