This has (almost certainly) nothing to do with RStudio or even the version of R you are using. Most likely you introduced an error in adapting your script.
To get help, please produce a reproducible example:
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:
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