Shiny app deployment error

Hi there,

I am trying to deploy my own Shiny app but it always gives me the following error information:

----- Bundle upload started at 2019-11-26 14:34:20 -----
[2019-11-26 14:34:20] Inferring App mode and parameters
[2019-11-26 14:34:20] Bundling app dir
[2019-11-26 14:34:20] Generate manifest.json
[2019-11-26 14:35:25] Writing Rmd index if necessary
[2019-11-26 14:35:25] Compressing the bundle
POST /v1/bundles 4740ms
[2019-11-26 14:35:30] Starting upload now
----- Deployment error -----
Error in curl::curl_fetch_memory(url, handle = handle) :
Could not resolve host: shinyapps-upload.s3.amazonaws.com
Calls: ... tryCatch -> tryCatchList -> tryCatchOne ->

What can I do to solve this issue? Thanks.