Weird problem with LaTeX/excel2latex

Question

I try to use excel2latex for converting excel tables into LaTeX. Here is the simple code I am using:

\documentclass[10pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{booktabs}
\begin{document}
\begin{table}[htbp]
\centering
\caption{Add caption}
\begin{tabular}{rrrr}
\toprule
1     & 4     & 6     & 8 \\
\midrule
-53   & 9     & 10    & 10 \\
\bottomrule
\end{tabular}%
\label{tab:addlabel}%
\end{table}%
\end{document}

basically, when I copy the LaTeX code from excel2latex add-in and paste it in my LaTeX code, I get tons of errors but if I remove the last two lines and type it manually, it work.

Answer 1

When TeX shows ^^@, it wants to represent the ASCII character NUL (byte 0). Judging from the error messages, it seems that your editor has inserted a row consisting of NUL characters.

As a protection against this kind of invisible characters, LaTeX declares that ^^@ (or NUL) is invalid if found in the input file.

Check your file and zap the offending characters.