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Perhaps someone will find the reason in your log file. The command \listfiles can improve the overview of the package versions. The list is written at the end of the log file. The command is often inserted before the document class is loaded, but it does not have to be there. Due to the length of th...

Please read the section on bibliography commands in the package documentation. The resource you are adding is missing the filename extension.

Furthermore, the incomplete example does not show us whether you cited the reference.

Overleaf gives me the same error message, but not my current MiKTeX. An update can probably fix that.

Without a minimal working example, we can only guess. Did you run all programs in the correct order that you need to create a bibliography? The process should be explained in every LaTeX introduction.

The example is incomplete. You can use the command \boldsymbol of amsmath to make it bold.

You may also be interested in section 8 of voss-mathmode, which describes commands for parentheses.

\documentclass[12pt,a4paper,oneside]{book} \usepackage{latexsym} \usepackage{graphicx} \usepackage{amsmath,amsthm} \usepackage{amssymb} \usepackage{epsfig} \usepackage[T1]{fontenc} \usepackage{mathpazo} \usepackage{caption} \usepackage{tocloft} \usepackage{csquotes} \begin{document} %\newpage \begi...

Without an example already mentioned, I don't know where and how the centering takes place. The command \par ends the alignment.

A would have been nice. Use the environment of the same name, if it is a title page . I would like to offer two options: \documentclass[12pt,a4paper,oneside]{book} \usepackage{varwidth} \usepackage{showframe} \begin{document} {\raggedleft \begin{varwidth}{\linewidth} Name of Supervisor\\ Supervisor\...

How do you create your bibliography? Please show us an example to clarify this.

With a minimal working example, you increase the probability of getting help.