html output error with echo=FALSE option

[sumin5784]

html output error with echo=FALSE option

[cderv]

Below is code-chunk set-up
knitr::opts_chunk$set(eval = TRUE, echo = FALSE, warning = FALSE, message = FALSE, fig.align = "center", dev = c("png", "pdf"), dpi = 1200, cache = TRUE)

And this is what I have in my output

Where is the setup chunk define ?

What is the source content for your "About this Book" chapter ?

Which rendering approach are you using ? https://bookdown.org/yihui/bookdown/new-session.html

Another issue is the search button is not working. Even if I click search button, search box is not appearing on top of TOC. My old books, which I rendered about couple of years ago is working properly, not any html book I recently rendered is not working.

This is another topic, and this means another issue please. Thank you. You can share link of online books not working for you. thanks