Shiny R and Rmd

I am trying to have an input in shinyR change a params in an .rmd file. The rmd is saved in the www folder as report.rmd. First post so apologies if it isn't formatted properly.

title: "report"
output: html_document
n: NA


Using the App:
ui = fluidPage(
textInput("tripid", "Enter Trip"),
downloadButton("report", "Generate report")
server = function(input, output) {
output$report <- downloadHandler(

  filename = "report.html",
  content = function(file) {
    tempReport <- file.path(tempdir(), "report.Rmd")
    file.copy("report.Rmd", tempReport, overwrite = TRUE)
    params <- list(n = input$tripid)
    rmarkdown::render(tempReport, output_file = file,
                      params = params,
                      envir = new.env(parent = globalenv())


#Im getting the error Error in value[3L] :

argument "outputId" is missing, with no default

#Calls: local ... tryCatch -> tryCatchList -> tryCatchOne ->
#Execution halted

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