Code highlight problem after RStudio-server update.

I update my rstudio-server to 1.2.1335 today(ubuntu 18.10).

I can't see color of code after update.

How can I see code with color?


There is a post with solution here - Highlighting has disappeared

Thanks for your link.
But I have same problem after changing Rstudio & Editor theme.

Post closed to focus discussion here: Highlighting has disappeared