Shiny code not working correctly

I am using Shiny and trying to display my code contains a csv file input dialog a tabset with two tabs either using sidepanel/mainpanel or any other way. But my code is not running the code containing these elements. I am successfully able to login but do not know how to show the html code and take input after login.

Here is my code.

library(shiny)
library(shinyauthr)
library(shinyjs)
library(shinyWidgets)

user_base <- data.frame(
user = c("user1", "user2"),
password = c("pass1", "pass2"), 
permissions = c("admin", "standard"),
name = c("User One", "User Two"),
stringsAsFactors = FALSE,
row.names = NULL
)

ui <- fluidPage(
shinyjs::useShinyjs(),
div(class = "pull-right", shinyauthr::logoutUI(id = "logout")),
shinyauthr::loginUI(id = "login"),
setBackgroundColor(color = c("#F7FBFF", "#2171B5"), gradient = "linear", direction = "bottom"),
htmlOutput({
setBackgroundColor(color = c("#000000", "#000000"), gradient = "linear", direction = "bottom")
}),
ui2()
)
ui2<-function()
{
fileInput("file1", "Choose CSV File",
          multiple = FALSE,
          accept = c("text/csv",
                     "text/comma-separated-values,text/plain",
                     ".csv"))
tabsetPanel(type = "tabs",
          tabPanel("Summary of data", tableOutput("maindf")),
          tabPanel("Summary of data", tableOutput("user_table"))
  )
}

server <- function(input, output, session) {

  # call the logout module with reactive trigger to hide/show
  logout_init <- callModule(shinyauthr::logout, 
                        id = "logout", 
                        active = reactive(credentials()$user_auth))

  # call login module supplying data frame, user and password cols
  # and reactive trigger
  credentials <- callModule(shinyauthr::login, 
                        id = "login", 
                        data = user_base,
                        user_col = user,
                        pwd_col = password,
                        log_out = reactive(logout_init()))

  # pulls out the user information returned from login module
  user_data <- reactive({credentials()$info})

  output$user_table <- renderTable({

    # use req to only render results when credentials()$user_auth is TRUE
    req(credentials()$user_auth)
    user_data()
  })
  output$maindf<-renderTable({
  req(input$file1)
  testdb <- read.csv(input$file1$datapath,
                   header = input$header,
                   sep = input$sep,
                   quote = input$quote)
  req(credentials()$user_auth)
  ###### how to show main data frame????
  testdb
  })
}

shinyApp(ui = ui, server = server)

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