Error in normalize path R shiny
<p>This is my first question on stack overflow so I apologize in advance in case I ask a rather vague or difficult question.</p>

<p>I have been working on developing a small web app that extracts granular data from facebook pages using the Rfacebook package. I have completed the data extraction function for this web app and have now moved to developing the shiny UI and server functions using shinydashboard.</p>

<p>I have completed one phase of the dashboard development, and I had tested it multiple times successfully, however once I closed and saved RStudio and then relaunched it, I kept getting this error whenever I try runApp. </p>

<blockquote>
  <p>Warning: Error in normalizePath: path[1]="C:\Users\Adel\AppData\Local\Temp\RtmpIr7Hkl\widgetbinding16a456f01dfa": The system cannot find the file specified
  Stack trace (innermost first):
      1: shiny::runApp
  Error in normalizePath(path.expand(path), winslash, mustWork) : 
    path[1]="C:\Users\Adel\AppData\Local\Temp\RtmpIr7Hkl\widgetbinding16a456f01dfa": The system cannot find the file specified</p>
</blockquote>

<p>I tried removing and reinstalling all relevant packages, however it was a failure. 
I have also tried to create a file "widgetbinding16a456f01dfa" in the specified path, it resulted in rendering the shinydashboard, but it was non-functional dashboard. 
Furthermore, I tried changing projects on RStudio, the shinydashboard worked, however whenever I close and relaunch RStudio I receive the same error but vaguely different filenames (i.e widgetbinding[..different numbers])</p>

<p>There has been limited information about this bug online, I have a hunch it's an RStudio error and not a shiny one.</p>

<p>Below is the code I used for the ui.r </p>

<pre><code>library(shiny)
library(shinydashboard)
library(shinythemes)
library(DT)
library(Rfacebook)

header &lt;- dashboardHeader()

sidebar &lt;- dashboardSidebar(
  sidebarMenu(

    textInput("f_id", "Enter Facebook Page ID", value = "Enter ID ..."),
    dateRangeInput('dateRange',
                   label = 'Input Date',
                   start = Sys.Date() - 2, end = Sys.Date() + 2),
    actionButton("go", "Go")
  )
)


body &lt;- dashboardBody(
  fluidRow(
    dashboardBody(
      dataTableOutput("table1",height = 5, width = "20") 
    )  
)     )

shinyUI(
  dashboardPage(header,sidebar,body))
</code></pre>

<p>Below is the code I wrote for the server.R</p>

<pre><code>shinyServer(function(input,output){

  table &lt;- eventReactive(input$go, {
    facebook_analyzer(input$f_id, since = format(input$dateRange[1])
                      , until = format(input$dateRange[2]))
})  

  output$table1 &lt;-  renderDataTable(
     datatable((table()[,c("poster_name","poster_id","post_content","date_of_post")]), 
               options = list(pageLength = 5, deferRender = TRUE )))
  }) 
</code></pre>

<p>Any help would be extremely appreciated, I have been trying to debug this error for two days. Thank you!</p>