title: Warning: BRK.B download failed; trying again. [Quantmod] R package
body: <p>I have ran into an error when trying to download a list of symbols using the quantmod package.</p>
  
  <p>I have the following;</p>
  
  <pre><code>startdate &lt;- "2017-11-05"
  enddate &lt;- "2018-01-20"
  
      Symbols &lt;- c("XOM","MSFT","JNJ", "BRK.B","GE","CVX","WFC","PG","JPM","VZ","PFE","T","IBM","MRK","BAC","DIS","ORCL","PM","INTC","SLB")
  
  
  
      dailyreturns = lapply(Symbols, function(sym) {
        dailyReturn(na.omit(getSymbols(sym, from= startdate, to = enddate, auto.assign=FALSE, src = "yahoo")))
      })
  </code></pre>
  
  <p>Which returns the following error message;</p>
  
  <pre><code>Warning: BRK.B download failed; trying again.
  </code></pre>
  
  <p>I have tried to use <code>complete cases</code> and other methods to skip failed download data but still this error persists</p>
  
  <pre><code>Warning: BRK.B download failed; trying again.
  Error: BRK.B download failed after two attempts. Error message:
  HTTP error 404.
  Called from: getSymbols.yahoo(Symbols = "BRK.B", env = &lt;environment&gt;, verbose = FALSE, 
      warnings = TRUE, auto.assign = FALSE, from = "2017-11-05", 
      to = "2018-01-20")
  </code></pre>
  
  <p>Thanks in advance!</p>