title: How to solve this error message in rmarkdown?
body: <p>I am just starting to explore the <code>rmarkdown</code> package. I don't use <code>Rstudio</code>. I use the default R environment. What I did was as follows. </p>
  
  <p>I created a new R document.
  Started typing few lines in <code>rmarkdown</code> format.
  Saved the file with <code>Rmd</code> extension.
  I saved the file in the working directory.
  I installed the <code>pandoc</code> using the pkg file.
  I installed 'rmarkdown' package. Loaded the package. 
  Used the following command to render the <code>Rmd</code> file.</p>
  
  <pre><code>rmarkdown::render("Untitled.Rmd")
  </code></pre>
  
  <p>I get the following error.</p>
  
  <blockquote>
    <p>Error in tools::file_path_as_absolute(input) : file 'Untitled.Rmd'
    does not exist</p>
  </blockquote>
  
  <p>I tried all the possible ways such as giving the exact path instead of filename etc. But nothing worked out. I googled the error message and found that none had similar error. Can someone help me with this. What I am missing. What the error message mean?</p>