R - Visualizing Project - Graph Line not Visible and Error

This is project in R about Visualizing Carbon Dioxide Levels. I ran the code as per instructions but I do not see graph with lines for Carbon Dioxide over Time Line Graph. Could you please check the below guide and advise me on the issue

Adding the below line to code gave me an error

noaa_viz + scale_x_reverse(lim=c(800000,0))
Error in -x: invalid argument to unary operator

Please help me on these two issues

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