How can I fix the limits on my x and y values, and remove the "NA introduced by coercion error"

I am trying to make my first Shiny, and I am struggling to correct the following error messages:

Warning in xy.coords(x, y, xlabel, ylabel, log) :
NAs introduced by coercion
Warning in min(x) : no non-missing arguments to min; returning Inf
Warning in max(x) : no non-missing arguments to max; returning -Inf
Error in plot.window(...) : need finite 'ylim' values

Here is a reprex of the code I have written. I would greatly appreciate any tips.

   library(shiny)
   library(ggplot2)
   
   library(readxl)
   RB <- read_excel("RB.xlsx")
   
   ui<-fluidPage(
       
       titlePanel("Runningback Shiny Project"),
       
       sidebarLayout(sidebarPanel(
           selectInput(inputId= "Conference",
                       label="Conference",
                       sort(unique(RB$Conference)),
                       multiple=T),
           selectInput(inputId = "Year",
                       label="Draft Year",
                       sort(unique(RB$Year)),
                       multiple=T),
           selectInput(inputId = "Round",
                       label="Round",
                       sort(unique(RB$Rnd)),
                       multiple=T),
           selectInput(inputId= "x_axis_variable",
                       label="X Axis Variable",
                       choices =c(RB[2,3,5,12:19,21:33]),
                       min("x_axis_variable"=1, na.rm = T),
                       max("x_axis_variable"=10000, na.rm = T),
                       multiple=F,
                       selected=RB$`40 Yard`),
           selectInput(inputId = "y_axis_variable",
                       label="Y Axis Variable",
                       choices =c(RB[2,3,5,7:10,12:19,21:50]),
                       min("y_axis_variable"=1, na.rm = T),
                       max("y_axis_variable"=10000, na.rm = T),
                       multiple=F,
                       selected=RB$`Rush Yds`)),
           
           mainPanel(
               plot("scatterplot"), height= "750px",
               plot.window(xlim = 1,10000, ylim = 1,10000, log="x,y", asp=NA),
           ),
       ))
   
   
   server<-function(input,output)  {
       
       output$scatterplot<-renderPlot({
           expr
           width = "auto"
           height = "auto"
           res = 72
           
           validate(
               need(input$x_axis_variable != input$y_axis_variable)
           )
       })
   }
   
   
   shinyApp(ui = ui, server = server)