Missing vertical line in table [closed]

Question

I'm new to LaTeX and learning quite quickly thanks to this site, among others that teach me quick fixes for my mistakes, but I can't seem to find a fix for this, I'm not able to draw the right border for this table, this is the code, am I doing something wrong?

\begin{center}
\begin{tabular}{|rccccc|}
\hline
  1 & 2 & 3 & 4 & 5 \\
  1 & 2 & 3 & 4 & 5 \\
  1 & 2 & 3 & 4 & 5 \\
\hline
\end{tabular}
\end{center}

(package tabu is loaded in top of the document).

Edit: Problem solved... The solution was simple: I defined 6 rows and only filled 5, so I had to add & 6 at the end of each line, before \, like this:

\begin{center}
\begin{tabular}{|rccccc|}
\hline
  1 & 2 & 3 & 4 & 5 & 6\\
  1 & 2 & 3 & 4 & 5 & 6\\
  1 & 2 & 3 & 4 & 5 & 6\\
\hline
\end{tabular}
\end{center}