How to make a data frame selecting shiny app in R?

I have a data frame with three columns:

x = data.frame(group=c("group1", "group2", "group3","group1","group3", "group4", "group2"),
               user=c("user1", "user3", "user5", "user9", "user14", "user18", "user24"),
               erro=c("error1", "error2", "error4", "error3", "error2", "error1", "error3") 
               )
x

I need to create a shiny app that shows in data table a list of rows from that table which have only error2 and error3. As a control widget I need a filter of group type. How could i built it? I'm new in shiny.