Command undefined in longtable table when rendering with document

Question

I have a table that I am trying to embed in my document. The table renders by itself without any issue, but when rendering with the rest of the document it throws the following error:
! LaTeX Error: Command 1 undefined.

Not sure what the problem could be. can anyone help with this? MWE is as follows.
documentclass{article}
usepackage[a4paper,margin=2.5cm]{geometry}
usepackage{array}
usepackage{ragged2e}
usepackage{longtable}
usepackage{booktabs}

begin{document}

centering
normalsize
renewcommandarraystretch{1.2}
begin{longtable}{>{hspace{0pt}}m{0.081linewidth}>{hspace{0pt}}m{0.536linewidth}>{RaggedLefthspace{0pt}}m{0.274
linewidth}}
toprule
 No. & Search terms & Number of par{}results endfirsthead 
hline
1 & childh &  
bottomrule
end{longtable}

end{document}

David Carlisle · Accepted Answer

The code you post generates no error however the error you show can be obtained by adding expandafter to your code.
documentclass{article}
usepackage[a4paper,margin=2.5cm]{geometry}
usepackage{array}
usepackage{ragged2e}
usepackage{longtable}
usepackage{booktabs}

begin{document}

expandafter
renewcommandarraystretch{1.2}

end{document}

Produces:
! LaTeX Error: Command 1 undefined.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.13 renewcommandarraystretch
                               {1.2}
?

Note that you only showed the first line, if you show the full error as here from ! to ? then you will get more context on the location of the error.

Command undefined in longtable table when rendering with document

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