write data using xlsReadWrite

Hai, I have change it to these, but error and I couldn't fix it. Do you have
any idea why?

file <- system.file("D:\\FYP\\image\\Cropped Images\\user61",
"forgerUser61.xlsx", package = "xlsx")
wb <- loadWorkbook("forgerUser61.xlsx")
sheets <- getSheets(wb)
sheet <- sheets[["all"]]
res <- readRows(sheet, startRow=4, endRow=5, startColumn=2, endColumn=3)

Error in readRows(sheet, startRow = 4, endRow = 5, startColumn = 2,

endColumn = 3) :

attempt to apply non-function

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