Shiny server error: An error has occured. Check your logs or contact the appauthor for classification.

How can I solve this problem?

Have you installed rmarkdown? Do you get any error message while installing?

Have in mind that you need to install rmarkdown system wide for shiny-server to be able to use it.

Also, please check if there are any logs available for that application at this folder /var/log/shiny-server/

I had installed rmarkdown and it thrown this error.
Before installed "rmarkdown", it showed "An error has occurred". As below picture:

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