R闪亮：无法下载互动报告

我希望下载一个交互式R闪亮文档，并将其保存到一个文件，供其他用户（不拥有R或Rstudio）查看和交互 . R闪亮文档运行正常，但当我尝试将下载的文件保存到某处时，下载按钮失败 . 这是我的代码;我使用了数据集'cars'，因此可以重现错误：

闪亮的代码：

library(knitr)
library(shiny)
library(ggplot2)
library(readr)

x <- cars
x$dist_cut <- cut(x$dist, breaks = c(-1, 25, 50, 75, 100, 9999), 
                       labels = c("0-25", "26-50", "51-75", "76-100", ">100"))

t.cut <- table(x$dist_cut)

# Define UI for dataset viewer app ----
ui <- fluidPage(

  # App title ----
  titlePanel("Cars Data"),

  # Sidebar layout with a input and output definitions ----
  sidebarLayout( position = "right",

                 # Sidebar panel for inputs ----
                 sidebarPanel(

                   # Input: Selector for choosing dataset ----
                   selectInput(inputId = "dataset",
                               label = "Choose a range for dist:",
                               choices = c("show all", ">100", "76-100", "51-75", "26-50", "0-25")),
                   downloadButton('downloadReport')

                 ),

                 # Main panel for displaying outputs ----
                 mainPanel(

                   # Output: Barplot ----
                   plotOutput(outputId = "distPlot"),

                   # Output: HTML table with requested number of observations ----

                   DT::dataTableOutput("view")


                 )
  )
)

# Define server logic to summarize and view selected dataset ----
server <- function(input, output) {

  # Return the requested dataset ----
  datasetInput <- reactive({
    switch(input$dataset,
           "show all" = x,
           ">100" = x[x$dist_cut == ">100",],
           "76-100" = x[x$dist_cut == "76-100",],
           "51-75" = x[x$dist_cut == "51-75",],
           "26-50" = x[x$dist_cut == "26-50",],
           "0-25" = x[x$dist_cut == "0-25",])
  })

  # display the plot
  output$distPlot <- renderPlot({

    barplot(t.cut, beside = TRUE, col = c("green", "blue", "yellow", "orange", "red"), main = "Cars sorted by dist", ylim = c(0, 20), cex.main = 1.5, xlab = "dist", ylab = "Frequency")

  })

  # create the DT datatable
  output$view = DT::renderDataTable({
    DT::datatable(datasetInput(), filter = 'top', 
                  options = list(lengthMenu = c(5, 10, nrow(x)), pageLength = 5))

  })

  output$report <- downloadHandler(
    filename = function() paste0("report", ".html"),
    content = function(file) {
      tempReport <- file.path(tempdir(), "report.rmd")
      file.copy("report.rmd", tempReport, overwrite = TRUE)

      # Set up parameters to pass to Rmd document
      params <- list(data = x,
                     title = "Plot Title",
                     limits = c(-10,10))
      # Knit the document, passing in the `params` list, and eval it in a
      # child of the global environment (this isolates the code in the document
      # from the code in this app).
      rmarkdown::render(tempReport, output_file = file,
                        params = params,
                        envir = new.env(parent = globalenv())
      )
    }     
  )

}

# Create Shiny app ----
shinyApp(ui = ui, server = server)

Rmarkdown代码：

---
output: html_document
params:
    data: NULL
    limits: NULL
    title: "Cars Data"
title: "`r params$title`"
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)

print(params$title)
barplot(table(params$x$dist_cut), beside = TRUE, col = c("green", "blue", "yellow", "orange", "red"), main = "Cars Split by dist", ylim = c(0, 20), cex.main = 1.5, xlab = "dist", ylab = "Frequency") 
library(DT) 
datatable(params$x, filter = 'top', options = list(lengthMenu = c(5, 10, nrow(x)), pageLength = 5))

使用此代码，我在单击下载按钮后收到以下警告和错误：

```java
Warning: Error in : path for html_dependency not provided
  [No stack trace available]
Warning in min(w.l) : no non-missing arguments to min; returning Inf
Warning in max(w.r) : no non-missing arguments to max; returning -Inf
Warning in min(x) : no non-missing arguments to min; returning Inf
Warning in max(x) : no non-missing arguments to max; returning -Inf
Warning: Error in plot.window: need finite 'xlim' values

我还收到一个 Headers 为“下载失败”的弹出窗口，说明：

Error downloading {R shiny html link} - server replied: Internal Service Error

我花了大约一个星期试图调试这个，我还没弄清楚我错过了什么 . 我是R闪亮的Web应用程序的新手，并且非常希望允许非R用户查看这些交互式报告以帮助他们完成工作 . 我希望这是足够的信息，以帮助找到我的问题的解决方案 .

谢谢！

更新：当我保存HTML文件并在Internet Explorer中打开它时，我只看到页面顶部的 Headers （汽车数据）和侧边栏面板（包含下拉框和下载按钮） . 另外，我得到一个提示，说明“Internet Explorer限制此网页运行脚本或ActiveX控件”，当我按下“允许阻止的内容”时没有任何反应 . 这与问题有关吗？

我为最初没有发布可重现的示例而道歉：这是我的第一篇stackoverflow帖子 .