Shiny Deployment Issue: Unable to connect to worker after 60.00 seconds; startup took too long

I keep running into this issue when trying to deploy my ShinyApp. It was load for a long time before it gives me a page that just says:

Unable to connect to worker after 60.00 seconds; startup took too
long.

When I run it locally, it loads fine. It's just when I try to deploy.

When I check the logs, I don't see anything that stands out as an error:

2019-11-02T22:08:15.295351+00:00 shinyapps[1414419]: 
2019-11-02T22:08:15.325246+00:00 shinyapps[1414419]: 
2019-11-02T22:08:15.325249+00:00 shinyapps[1414419]: Attaching package: ‘DT’
2019-11-02T22:08:15.330411+00:00 shinyapps[1414419]: The following objects are masked from ‘package:shiny’:
2019-11-02T22:08:15.325249+00:00 shinyapps[1414419]: 
2019-11-02T22:08:15.330412+00:00 shinyapps[1414419]: 
2019-11-02T22:08:15.330413+00:00 shinyapps[1414419]:     dataTableOutput, renderDataTable
2019-11-02T22:08:15.330413+00:00 shinyapps[1414419]: 
2019-11-02T22:11:30.330838+00:00 shinyapps[1414419]: Server version: 1.7.8-7
2019-11-02T22:11:30.330879+00:00 shinyapps[1414419]: LANG: en_US.UTF-8
2019-11-02T22:11:30.330880+00:00 shinyapps[1414419]: R version: 3.5.2
2019-11-02T22:11:30.330881+00:00 shinyapps[1414419]: shiny version: 1.4.0
2019-11-02T22:11:30.330881+00:00 shinyapps[1414419]: httpuv version: 1.5.2
2019-11-02T22:11:30.331131+00:00 shinyapps[1414419]: Using pandoc at /opt/connect/ext/pandoc2
2019-11-02T22:11:30.483495+00:00 shinyapps[1414419]: Using jsonlite for JSON processing
2019-11-02T22:11:30.489371+00:00 shinyapps[1414419]: 
2019-11-02T22:11:30.489376+00:00 shinyapps[1414419]: Starting R with process ID: '25'
2019-11-02T22:11:30.330892+00:00 shinyapps[1414419]: knitr version: 1.24
2019-11-02T22:11:30.330881+00:00 shinyapps[1414419]: rmarkdown version: 1.15
2019-11-02T22:11:30.330893+00:00 shinyapps[1414419]: jsonlite version: 1.6
2019-11-02T22:11:30.330897+00:00 shinyapps[1414419]: RJSONIO version: (none)
2019-11-02T22:11:30.330912+00:00 shinyapps[1414419]: htmltools version: 0.4.0
2019-11-02T22:11:32.177195+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.177197+00:00 shinyapps[1414419]: Attaching package: ‘dplyr’
2019-11-02T22:11:32.177197+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.177951+00:00 shinyapps[1414419]: The following object is masked from ‘package:civis’:
2019-11-02T22:11:32.177952+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.177952+00:00 shinyapps[1414419]:     sql
2019-11-02T22:11:32.177952+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.178657+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.180317+00:00 shinyapps[1414419]: The following objects are masked from ‘package:base’:
2019-11-02T22:11:32.180319+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.178656+00:00 shinyapps[1414419]: The following objects are masked from ‘package:stats’:
2019-11-02T22:11:32.178656+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.178657+00:00 shinyapps[1414419]:     filter, lag
2019-11-02T22:11:32.180321+00:00 shinyapps[1414419]:     intersect, setdiff, setequal, union
2019-11-02T22:11:32.180321+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.316188+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.316191+00:00 shinyapps[1414419]: Attaching package: ‘shinydashboard’
2019-11-02T22:11:32.316192+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.316471+00:00 shinyapps[1414419]: The following object is masked from ‘package:graphics’:
2019-11-02T22:11:32.316472+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.316472+00:00 shinyapps[1414419]:     box
2019-11-02T22:11:32.316473+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.348048+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.348049+00:00 shinyapps[1414419]: Attaching package: ‘DT’
2019-11-02T22:11:32.348050+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.355242+00:00 shinyapps[1414419]: The following objects are masked from ‘package:shiny’:
2019-11-02T22:11:32.355244+00:00 shinyapps[1414419]: 
2019-11-02T22:11:32.355245+00:00 shinyapps[1414419]:     dataTableOutput, renderDataTable
2019-11-02T22:11:32.355245+00:00 shinyapps[1414419]: 

I've been trying to Google search the answer, but nothing seems to be helping.

Does it work with other apps?
I see it is attaching the DT package twice, for some reason.
Is there a large data file that it uploading?
Did you make sure you are only uploading the files you need?
It could also be a temporary issue with shinyapps.io, did you try again later?