r markdown - Blank output in R with Warning message: [WARNING] This document format requires a nonempty <title> element

Question

I've encountered a problem in Rstudio (R-Markdown), whenever I knit my file it would just load a blank page. I've been using Rstudio and it has been working fine until last night.

The error/warning message is shown in the pic below. I'm kinda new so I'm hoping you could guide me to what I did wrong and what I need to do.

Rmd with Warning message and the HTML Output

question from:https://stackoverflow.com/questions/65894398/blank-output-in-r-with-warning-message-warning-this-document-format-requires

Answer 1

Waitting for answers