title: How to solve the error `could not find function "dashboardHeaderPlus"` in R shiny app
body: <p>I am referring to the R Shiny code in the following Github repository:<a href="https://github.com/ganapap1/Dynamic_Filter/blob/main/Multi%20Filter%20Datatable%20with%20SliderInput.R" rel="nofollow noreferrer">https://github.com/ganapap1/Dynamic_Filter/blob/main/Multi%20Filter%20Datatable%20with%20SliderInput.R</a></p>
  <p>When I tried to learn more about it, I got the following error. Could someone assist me in resolving this problem?</p>
  <p>Error :</p>
  <pre><code>Error in dashboardHeaderPlus(title = NULL, tags$li(a(splitLayout(cellWidths = c(&quot;50%&quot;,  : 
    could not find function &quot;dashboardHeaderPlus&quot;
  </code></pre>