Error when trying to input an external file with xltabular package `\hline ->\noalign`

Question

I am trying to stack several tables one on another. For this I am using xltabular packages. I want to input text from another file. The following code works without problem when removing / commenting out the line:

\input{so_text.txt}

however if I remove / comment out the following lines (and want to input the exact same content with \input{so_text.txt} with the file containing that text:

blasasfd&1&h&bla\\
blasasfd&2&h&bla \\
blasasfd&5&h&bla \\

I get the following error message:

\hline ->\noalign
                  {\ifnum 0=`}\fi \hrule \@height \arrayrulewidth \futurelet...
l.14     \end{xltabular}

Here is the code

\documentclass[a4paper, 12pt]{article}
\usepackage{xltabular}
\usepackage{caption}
\begin{document}
{
    \begin{xltabular}{\linewidth}{| p{3cm} p{2.4cm} p{2.4cm} p{2.4cm}| }
    \caption{text} \label{key}\
    \endlastfoot
        \hline
 \textbf{Bla}&\textbf{ a}&\textbf{b}&\textbf{ c}\ 
% \input{so_text.txt}
blasasfd&1&h&bla\
blasasfd&2&h&bla \
blasasfd&5&h&bla \
        \hline
    \end{xltabular} 
}
\end{document}

What am I doing wrong?