any experts around please? I am getting strange error with TL 2013 at this line and do not know what to make of it. Here is the error:

(/usr/local/texlive/2013/texmf-dist/tex/latex/amsfonts/umsb.fd)
! Undefined control sequence.
\a:newlabel ...utoref\string \endcsname {\NR:Type
                                                  }#1}
l.49 \end{equation}

?

Hence%

\begin{equation}
y\left(  t\right)  =e^{-\zeta\omega_{n}t}\left(  A\sin\omega_{d}t+B\cos
\omega_{d}t\right)  +\frac{p_{0}}{k}\frac{1}{\left(  1-\beta^{2}\right)
^{2}+\left(  2\zeta\beta\right)  ^{2}}\left(  \left(  1-\beta^{2}\right)
\sin\varpi t-2\zeta\beta\cos\varpi t\right)  \label{eq1}%
\end{equation}

I did. same error:

>rm *.aux
rm: remove regular file ‘note_on_lecture_2_21_2013.aux’? y
>


! Undefined control sequence.
\a:newlabel ...utoref\string \endcsname {\NR:Type
                                                  }#1}
l.128 \end{equation}

?

\documentclass[12pt]{article}%
\usepackage{hyperref}
\begin{document}
\begin{equation} \label{eq1}
y\left(  t\right)  =e^{-\zeta\omega_{n}t}\left(  A\sin\omega_{d}t+B\cos
\omega_{d}t\right)  +\frac{p_{0}}{k}\frac{1}{\left(  1-\beta^{2}\right)
^{2}+\left(  2\zeta\beta\right)  ^{2}}\left(  \left(  1-\beta^{2}\right)
\sin\varpi t-2\zeta\beta\cos\varpi t\right)  %
\end{equation}
\end{document}

! Undefined control sequence.
\a:newlabel ...utoref\string \endcsname {\NR:Type
                                                  }#1}
l.6 \begin{equation} \label{eq1}

Warning (initialization): An error occurred while loading `/home/knsam/.emacs':

File error: Cannot open load file, auctex.el

To ensure normal operation, you should investigate and remove the
cause of the error in your initialization file.  Start Emacs with
the `--debug-init' option to view a complete error backtrace.

Debugger entered--Lisp error: (file-error "Cannot open load file" "auctex.el")
  load("auctex.el" nil t t)
  eval-buffer(#<buffer  *load*> nil "/home/knsam/.emacs" nil t)  ; Reading at buffer position 106
  load-with-code-conversion("/home/knsam/.emacs" "/home/knsam/.emacs" t t)
  load("~/.emacs" t t)
  #[0 "\205\262

knsam@PerverseSheaf:~/.emacs.d/elpa/auctex-11.86$ ls
auctex-autoloads.el   auctex-pkg.elc  context-en.el   font-latex.el   multi-prompt.el     prv-emacs.elc  tex-buf.elc   tex-font.el    tex-jp.el     tex-site.el
auctex-autoloads.el~  bib-cite.el     context-en.elc  font-latex.elc  multi-prompt.elc    README         tex.el        tex-font.elc   tex-jp.elc    tex-site.elc
auctex.info           bib-cite.elc    context-nl.el   images          preview.el          style          tex.el~       tex-fptex.el   texmathp.el   tex-style.el

(define-package "auctex" "11.86" "Integrated environment for *TeX*")

Runaway argument?
{bibliography = {{Bibliografia}{Bibliografia}}, references = {{Refer\^\ETC.
! Paragraph ended before \DeclareBibliographyStrings was complete.
<to be read again>
                   \par
l.454

    330   nodate           = {{sem\space data}{{s\adddot d\adddot}},

    330   nodate           = {{sem\space data}{s\adddot d\adddot}},

 STRING="\usepackage?{?}"
    DBL_CLICK_ENABLED=1
    DBL_CLICK_MODE_FILTER="TeX|AUX"
    DBL_CLICK_MACRO="[Assign('LaTeXDoc','Active');"+
                     "Exe('%b\Macros\Doc\LaTeXDoc.edt');]"

\begin{minipage}[htbp]{0.5\textwidth}
\begin{table}
    \begin{tabular}{c|c}
    Cycle Type   & \# elements \\\hline
    (3, 1)       & 8           \\
    (2, 2)       & 3           \\
    (1, 1, 1, 1) & 1           \\
    \end{tabular}
\caption{Cycle Types in $A_4$}
\end{table}
\end{minipage}

\begin{table}
\centering
\hfill\begin{minipage}{.3\textwidth}
\begin{tabular}{...}
...
\end{tabular}
\caption{A}
\end{minipage}\hfill
\begin{minipage}{.3\textwidth}
\begin{tabular}{...}
...
\end{tabular}
\caption{B}
\end{minipage}\hfill
\end{table}