WHAT IS WRONG WITH "arrange"

[yuyu1]

[jrkrideau]

I think you are missing an |> after

select(-upper, -lower)

Please do not send screenshots. They are difficult to work with. Your screenshot is very clear but often they are difficult to read.
It is much better to copy the code and paste it here between

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This gives us formatted code that we can copy, paste and run . Often a person here does not have the time to type out code to test it and find a problem.

A handy way to supply data is to use the dput() function. Do dput(mydata) where "mydata" is the name of your dataset. For really large datasets probably dput(head(mydata, 100)) will do. Paste the output between
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You may also find this useful.
FAQ: How to do a minimal reproducible example ( reprex ) for beginners

FAQ: How to do a minimal reproducible example ( reprex ) for beginners

A minimal reproducible example consists of the following items: A minimal dataset, necessary to reproduce the issue The minimal runnable code necessary to reproduce the issue, which can be run on the given dataset, and including the necessary information on the used packages. Let's quickly go over each one of these with examples: Minimal Dataset (Sample Data) You need to provide a data frame that is small enough to be (reasonably) pasted on a post, but big enough to reproduce your issue. Let's say, as an example, that you are working with the iris data frame head(iris) #> Sepal.Length Sepal.Width Petal.Length Petal.Width Species #> 1 5.1 3.5 1.4 0.2…