I am having a latex document with a template which was given to me by some one.I have 205 errors that I see in overleaf document. the statements give me a link to follow ,that link is following https://www.overleaf.com/learn/latex/Errors/Undefined_control_sequence I see following statement
\begin{document}
where I see errors it says thesis.tex line 367
The files I have are following names dir /b the output is following in thesis folder
biblio.bib
tg.cls
itglogo-eps-converted-to.pdf
itglogo.eps
logo-eps-converted-to.pdf
README.md
STYLES (directory)
texfiles (directory)
thesis.aux
thesis.idx
thesis.lof
thesis.log
thesis.lot
thesis.out
thesis.pdf
thesis.synctex.gz
thesis.tex
thesis.toc
there are a lot of files in subdirectory texfiles
abrreviation.tex
abstract.tex
abstract.tex.backup
abstract.tex~
acknowledgments.tex
acknowledgments.tex~
arydshln.sty
bibthesis.bib
chapter1.log
chapter1.tex
chapter2.tex
chapter3.tex
chapter4.tex
chapter5.tex
chapter6.tex
conclusion.tex
conclusion.tex~
cv.tex
cv.tex~
images
symbol.tex
thesis.bib.backup
thesis.bib~
I am not able to understand how do I debug it? What can I do to remove the errors. This was a custom template some one got from another university and gave it to us. We do not have an IT or library department to ask questions as what is it doing.Which files there are errors what are the errors. here is a link to all the files you can see it https://www.overleaf.com/3838449319pjhnfzpgvypm

.auxfile (hard to tell from what you have posted) but also does that screenshot mean you have all those styles in a local directory? If so, why? they are almost all standard packages thar are in texlive so available in overleaf. – David Carlisle Mar 14 '20 at 17:43