LaTeX | hyperref error | Argument of � has an extra }. \end{document} - latex

Question

I got a new PC with Windows 10 Pro operating system several days ago and decided to install TeXstudio + MiKTeX.
And I faced a problem compiling LaTeX file. The problem is when I try to add \usepackage{hyperref} or code stuff similar to this line (more detailed in the code with the comment line % problem is here if I add this line) I get an error which says: Argument of � has an extra }. \end{document}.
My code:
\documentclass[10pt,a4paper]{report}
\usepackage{cmap}
\usepackage{setspace}
\onehalfspacing
\usepackage{multicol}
\usepackage{textcomp}
\usepackage{verbatim}
\usepackage{floatrow,calc}
\DeclareFloatSeparators{mysep}{\hspace{3cm}}
\thisfloatsetup{floatrowsep=mysep}
\usepackage{ucs}
\usepackage[pdftex]{graphicx}
\usepackage{epstopdf}
\usepackage{amssymb,amsmath}
\DeclareGraphicsExtensions{.pdf, .png, .jpg}
\usepackage[labelsep=period]{caption}
\usepackage[utf8x]{inputenc}
\usepackage[T2A]{fontenc}
\usepackage[russian, english]{babel}
\usepackage[left=3cm, right=1.5cm, top=1.5cm, bottom=2cm]{geometry}
\usepackage{indentfirst}
\usepackage{color}
\definecolor{Black}{rgb}{0,0,0}
\usepackage[unicode, colorlinks, linkcolor=Black]{hyperref} % problem is here if I add this line
\usepackage{xcolor}
\definecolor{linkcolor}{HTML}{000000}
\definecolor{urlcolor}{HTML}{000000}
\hypersetup{pdfstartview=FitH, linkcolor=linkcolor, urlcolor=urlcolor, colorlinks=True} % problem is here if I add this line
\fontfamily{ptm}
\parindent=1cm
\sloppy
\bibliographystyle{unsrt}
\usepackage{hyperref} % problem is here if I add this line
\usepackage{fancyhdr}
\pagestyle{fancy}
\fancyhf{}
\lhead{\leftmark}
\cfoot{\thepage}
\renewcommand{\headrulewidth}{1pt}
\usepackage{subfig}
\usepackage{epigraph} %%% to make inspirational quotes.
\usepackage{amsfonts}
\begin{document}
Random text
${\mathcal {E}}=-{{d\Phi_{B}} \over dt},$ where
${\mathcal {E}}$ — random letter.
\end{document}
Error I get:
Error
When I try this code in OverLeaf or on my notebook or without hyperref packages - everything's fine. But I need this package if, for example, I'll have to add references...
Did someone face similar problem? Maybe I need to install some other packages?

Answer 1

A quote from the hyperref maintainer:
But I would recommend to drop utf8x/ucs. Most improvements in the handling of utf8 which e.g. allow you to use them in \labels and filenames are undone by utf8x/ucs.
If the ucs package and utf8x inputenc option is removed, your code compiles.
Furthermore you should remove the pdftex from graphicx. It will automatically choose the best suited option to match your compilation chain.
You should also not load the same package multiple times, in particular not with different options
And load hyperref after the other packages (there are only very view exceptions)
No need to load color if you also load xcolor
\documentclass[10pt,a4paper]{report}
\usepackage{cmap}
\usepackage{setspace}
\onehalfspacing
\usepackage{multicol}
\usepackage{textcomp}
\usepackage{verbatim}
\usepackage{floatrow,calc}
\DeclareFloatSeparators{mysep}{\hspace{3cm}}
\thisfloatsetup{floatrowsep=mysep}
%\usepackage{ucs}
\usepackage[
%pdftex
]{graphicx}
\usepackage{epstopdf}
\usepackage{amssymb,amsmath}
\DeclareGraphicsExtensions{.pdf, .png, .jpg}
\usepackage[labelsep=period]{caption}
%\usepackage[utf8x]{inputenc}
\usepackage[T2A]{fontenc}
\usepackage[russian, english]{babel}
\usepackage[left=3cm, right=1.5cm, top=1.5cm, bottom=2cm]{geometry}
\usepackage{indentfirst}
\usepackage{xcolor}
\definecolor{Black}{rgb}{0,0,0}
\fontfamily{ptm}
\parindent=1cm
\sloppy
\bibliographystyle{unsrt}
%\usepackage{hyperref} % problem is here if I add this line
\usepackage{fancyhdr}
\pagestyle{fancy}
\fancyhf{}
\lhead{\leftmark}
\cfoot{\thepage}
\renewcommand{\headrulewidth}{1pt}
\usepackage{subfig}
\usepackage{epigraph} %%% to make inspirational quotes.
\usepackage{amsfonts}
%\usepackage{xcolor}
\usepackage[unicode, colorlinks, linkcolor=Black]{hyperref} % problem is here if I add this line
\definecolor{linkcolor}{HTML}{000000}
\definecolor{urlcolor}{HTML}{000000}
\hypersetup{pdfstartview=FitH, linkcolor=linkcolor, urlcolor=urlcolor, colorlinks=True} % problem is here if I add this line
\begin{document}
Random text
${\mathcal {E}}=-\frac{{d\Phi_{B}} }{ dt},$ where
${\mathcal {E}}$ — random letter.
\end{document}