How to get rid of erroneous extra grid lines?

The below code is giving me an error:

How do I get rid of these bad extra lines? See image at the bottom.

begin{document}

begin{table}

begin{tabularx}{linewidth}{|r|r|r|r|r|}

hline

multicolumn{1}{|>{columncolor[gray]{.9}}c|}{$x$} &
multicolumn{1}{ >{columncolor[gray]{.9}}c|}{textbf{Actual}} &
multicolumn{1}{ >{columncolor[gray]{.9}}c|}{textbf{Approx.}} &
multicolumn{1}{ >{columncolor[gray]{.9}}c|}{textbf{% diff}} &
multicolumn{1}{ >{columncolor[gray]{.9}}c|}{textbf{% grow}} 



hline

2 & 1.0000 & 0.5576 & -44.2% & 0.0%  hline
3 & 2.0000 & 1.4943 & -25.3% & 168.0%  hline

end{tabularx}

end{table}

end{document}

Here’s the output:

Another error: