problem loading graphs-new user

I am fairly new to RStudio cloud. I am trying to self-teach, with the help of an online course. I am trying to create a Shiny App, using data imported from the online course. I have imported all my data, written the code, and can get the UI to come up, but the charts will not show and there is an error. I have had difficulty in the past with brackets and making sure they are in the correct place. Would someone please take a look and let me know if they see anything obvious I am missing?

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