Errors when Compile PDF on *.rnw in RStudio

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Code:
\documentclass{article}
\usepackage{longtable}
\usepackage[a4paper,margin=0.5in,landscape]{geometry}

\begin{document}

<<results='asis'>>=
  i <- 1
  while (i <= ncol(p_vec)) {
    library(xtable)
    
    xt = xtable(p_vec[,i:(i+8)])
    i <- i + 9
    print(xt, 
          tabular.environment = "longtable",
          floating = FALSE
    )
  }
  @
  
\end{longtable}
\end{document}

Error:
Writing to file knitr_large_table.tex
Processing code chunks with options ...
Error in match.arg(options$results, c("verbatim", "tex", "hide")) : 
  'arg' should be one of “verbatim”, “tex”, “hide”
Calls: <Anonymous> -> SweaveParseOptions -> check -> match.arg
Execution halted

Fix:
In RStudio
Tools -> Global Options
Sweave
Weave Rnw files using knitr

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