Avoid a weird error with ltablex

Question

I'd like to have an table over many pages with the same headline. I use the tabularx package, and the ltablex is required according to link. However if I use ltablex I get sticky errors ! LaTeX Error: There's no line here to end. Any idea how to solve it? A minimal example follows.

\documentclass[11pt]{article}
\usepackage{booktabs}
\usepackage{tabularx} % for tables http://www.lapomori.com/
%\usepackage{ltablex} 
\begin{document}

\begin{table}
\caption{Example of an table}
\label{tab:daypack}     
\begin{tabularx}{\linewidth}{@{}cX@{}}  
\toprule
\textbf{Column 1} & \textbf{Column 2} \\[6pt]
\midrule
%\endhead
$R$ & 1This is an example sentence \\[6pt]
$R$ & 2As well as the line before \\[6pt]
$A$ & 3Also this is an example \\[6pt]
$R$ & 4This is an example sentence \\[6pt]
$R$ & 5As well as the line before \\[6pt]
$A$ & 6Also this is an example \\[6pt]
$R$ & 7This is an example sentence \\[6pt]
$R$ & 8As well as the line before \\[6pt]
$A$ & 9Also this is an example \\[6pt]
$R$ & 10This is an example sentence \\[6pt]
$R$ & 11As well as the line before \\[6pt]
$A$ & 12Also this is an example \\[6pt]
$R$ & 13This is an example sentence \\[6pt]
$R$ & 14As well as the line before \\[6pt]
$A$ & 15Also this is an example \\[6pt]
$R$ & 16This is an example sentence \\[6pt]
$R$ & 17As well as the line before \\[6pt]
$A$ & 18Also this is an example \\[6pt]
$R$ & 19This is an example sentence \\[6pt]
$R$ & 20As well as the line before \\[6pt]
$A$ & 21Also this is an example \\[6pt]
$R$ & 22This is an example sentence \\[6pt]
$R$ & 23As well as the line before \\[6pt]
$A$ & 24Also this is an example \\[6pt]
$R$ & 25This is an example sentence \\[6pt]
$R$ & 26As well as the line before \\[6pt]
$A$ & 27Also this is an example \\[6pt]
$R$ & 28This is an example sentence \\[6pt]
$R$ & 29As well as the line before \\[6pt]
$A$ & 30Also this is an example \\[6pt]
$R$ & 31This is an example sentence \\[6pt]
$R$ & 32As well as the line before \\[6pt]
$A$ & 33Also this is an example \\[6pt]
$R$ & 34This is an example sentence \\[6pt]
$R$ & 35As well as the line before \\[6pt]
$A$ & 36Also this is an example \\[6pt]
$R$ & 37This is an example sentence \\[6pt]
\bottomrule
\end{tabularx} \\   
\end{table}


\end{document}

Answer 1

The no line here to end message is an indication of misuse of \\ which should almost never be used outside of an alignment.

Remove this one:

\end{tabularx}% \\   

Answer 2

I think that "\ [6pt]" works only inside of \begin{align}-\end{align} and \begin{eqnarray}-\end{eqnarray}. There shouldn't use "$ $".