normtoc.int not available

Im doing a study on ankle fractures and am trying to run a tolerance interval but I keep getting an error . This is the error I am receiving:

Error in normtol.int(TreatmentA.Improvement.in.AOFAS, alpha = 0.05, P = 0.95, : could not find function "normtol.int"
Can someone please help .
I tried to install the package but its not available as below message shows:
package ‘normtol.int’ is not available (for R version 3.6.3)

the package containing this function is called tolerance
source

the pipe function %>% belongs to the tidyverse package, and also can be found in the magrittr package.

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Thank you just got that there . This is the r code I have written :
TreatmentA.Improvement.in.AOFAS <-ankle.12.df %>%
filter(Treatment %in% 'A') %>% select(AOFAS) %>% as.data.frame()

normtol.int(TreatmentA.Improvement.in.AOFAS$AOFAS, alpha = 0.05, P = 0.95, side = 2)

and now im being faced with this error ;
Version:1.0 StartHTML:0000000107 EndHTML:0000000897 StartFragment:0000000127 EndFragment:0000000879

Error in ankle.12.df %>% filter(Treatment %in% "A") %>% select(AOFAS) %>% : could not find function "%>%"

once I fix one error it immediately faces me with a new one

Error in Treatment %in% "A" : object 'Treatment' not found

That's the way with errors.
It implies you got the script from another, and you need to get your computer set up like theres was for what you are doing to work.the last message says there is nothing called Treatment in the context you are using it.