" trying to use CRAN without setting a mirror" Error

I receive the following error message after uploading my 'ShinyApp' directory to shinyapps.io

Error in value[3L] : trying to use CRAN without setting a mirror
Calls: local ... tryCatch -> tryCatchList -> tryCatchOne ->
Execution halted

The path is correct and the application runs on my local machine. Here is how I specify my packages:
install.packages("shiny")
install.packages("leaflet")
install.packages("maps")
install.packages('maptools')
install.packages('rgeos')
install.packages('tigris')
install.packages('rsconnect')

#library(rsconnect)
#library(shiny)
library(leaflet)
library(maps)
library(maptools)
library(sp)
library(rgeos)
library(viridis)
library(tigris)
library(dplyr)
library(scales)

Any ideas?

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