Load an XML file into shiny

The attached picture is the server part of Shiny. (use XML packages) When I run like a picture, I get a warning that [Error: unable to find an inherited method for function ‘xmlToDataFrame’ for signature ‘"NULL", "missing", "missing", "missing", "missing"]
I think there is a problem importing the xml file, what is wrong?

Can you make this work for yourself in a non-shiny script ?

Even if I'm not working in shiny, the XML file doesn't work normally.

Can you therefore make a non shiny script to get your url, and share that here. Otherwise, I would have to type from what I read in your picture and I prefer not to do that.

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