Rstudio Viewer is not working for plotly and leaflet

I'm using latest version of rstudio, I wrote this code:

library(tidyverse)
library(plotly)
data("BOD")
head(BOD)
ggplotly(ggplot(BOD, aes(x = Time, y = demand)) + 
           geom_point())

and my rstudio viewer tab showed this not any plotly graph!!!!

/session/viewhtml17e429a6510a/index.html?viewer_pane=1&capabilities=1&host=http%3A%2F%2F127.0.0.1%3A12450 not found

I searched about it everywhere but did not got anything, I'll be so thankful if you can help me in that.

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