Unwanted vertical line in longtable

Question

I am trying to build a table using longtable and tabularx with the ltxtable. For some weird reason, unwanted vertical lines appear on the first row. This is my main.tex:

\documentclass[12pt,twoside]{report}
\usepackage{multirow}
\usepackage{tabularx}
\usepackage{longtable}
\usepackage{ltxtable}
\begin{document}
  \LTXtable{\linewidth}{table.tex}
\end{document}

This is table.tex:

\small
\begin{longtable}{| p{0.7cm} | X |}\label{tab:evaluation_survey}
\\ \hline
\multirow{2}{*}{e.1)} &  \textbf{Question}:\\
\cline{2-2}
& \textbf{Answers}: \\ \hline
\hline
\multirow{2}{*}{e.2)} &  \textbf{Question}: \\
\cline{2-2} 
& \textbf{Answers}:  \\ \hline
\hline
\multirow{2}{*}{e.3)} &  \textbf{Question}: \\ 
\cline{2-2} 
& \textbf{Answers}: \\ \hline
\hline
\multirow{2}{*}{e.4)} &  \textbf{Question}:\\ 
\cline{2-2} 
& \textbf{Answers}: \\ \hline
\end{longtable}

And this is what appears:

Edit: if I remove the \\ before the first \hline I receive \noalign and \omit errors

Answer 1

The problem arises from the usage of \label{} inside the table. Normally you use \label{} after the caption in the floating environment. I don't know LTXtable so I can't provide the correct placement for the \label{} but just to solve the issue there are several ways here (like placing the \label{} inside one of the existing rows etc.). One of this ways would be to use a \noalign{}:

Change the content of table.tex to:

\small
\begin{longtable}{| p{0.7cm} | X |}\noalign{\label{tab:evaluation_survey}}
\hline
\multirow{2}{*}{e.1)} &  \textbf{Question}:\\
\cline{2-2}
& \textbf{Answers}: \\ \hline
\hline
\multirow{2}{*}{e.2)} &  \textbf{Question}: \\
\cline{2-2} 
& \textbf{Answers}:  \\ \hline
\hline
\multirow{2}{*}{e.3)} &  \textbf{Question}: \\ 
\cline{2-2} 
& \textbf{Answers}: \\ \hline
\hline
\multirow{2}{*}{e.4)} &  \textbf{Question}:\\ 
\cline{2-2} 
& \textbf{Answers}: \\ \hline
\end{longtable}

Answer 2

I suggest this code, based on ltablex, which brings the functionalities of longtable to tabularx. I also redesigned the table, based on hhline and makecell so the cells do not look as tight as the default.

\documentclass{article}

\usepackage{multirow, ltablex, hhline, makecell}
\keepXColumns
\setcellgapes{1ex}

\begin{document}

\small\setlength\doublerulesep{2ex}%
\makegapedcells
\begin{tabularx}{\linewidth}{@{}p{0.7cm} |X|}
\caption{A questions and answers table}\label{tab:evaluation_survey}\\[-1ex]
\endfirsthead
\hhline{~|-}
\multirow{2}{=}{e.1)} & \textbf{Question}:\\%
\hhline{~|-}
& \textbf{Answers}: \\
\hhline{~:=}
\multirow{2}{=}{e.2)} & \textbf{Question}: \\
\hhline{~|-}
& \textbf{Answers}: \\
\hhline{~:=}
\multirow{2}{=}{e.3)} & \textbf{Question}: \\
\hhline{~|-}
& \textbf{Answers}: \\
\hhline{~:=}
\multirow{2}{=}{e.4)} & \textbf{Question}:\\
\hhline{~|-}
& \textbf{Answers}: \\
\hhline{~|-}
\end{tabularx}

\end{document}