Btukfyl

I am adapting the longtable example from this tutorial, but I can't replicate it.

Can I get help interpreting the following error?

Undefined control sequence.

adl@@cr ...tempdima xdef adl@rowsL {adl@rowsL (adl@colsL /number adl@...



adl@cr ->cr noalign {adl@@cr z@ 

                                 }

Here's the example code.

documentclass[12pt]{article}



usepackage{longtable} % To display tables on several pages

usepackage{arydshln}

usepackage{booktabs}

begin{document} 



  begin{longtable}[c]{l|c|r} % <-- Replaces begin{table}, alignment must be specified here (no more tabular)

  caption{Multipage table.}

  label{tab:table1}\

  toprule

  textbf{Value 1} & textbf{Value 2} & textbf{Value 3}\

  $alpha$ & $beta$ & $gamma$ \

  midrule

  endfirsthead % <-- This denotes the end of the header, which will be shown on the first page only

  toprule

  textbf{Value 1} & textbf{Value 2} & textbf{Value 3}\

  $alpha$ & $beta$ & $gamma$ \

  midrule

  endhead % <-- Everything between endfirsthead and endhead will be shown as a header on every page

  1 & 1110.1 & a\

  2 & 10.1 & b\

  % ...

  % ... Many rows in between

  % ...

  3 & 23.113231 & c\

  bottomrule

end{longtable}

end{document}

I have tried removing all aux files and recompiling. I also tried this example

Compiling with PdfLaTeX on Windows 10.