title: My neural network classifier reports "Unexpected CURL error"
body: <p>While defining my classifier, the following error message appears, no idea what to do with CURL error and installed R package bit64, but not moving forward what should I do with this:</p>
  
  <pre><code>classifier = h2o.deeplearning(y = 'Exited',
                            training_frame = as.h2o(training_set),
                            activation = 'Rectifier',
                            hidden = c(6,6),
                            epochs = 100,
                            train_samples_per_iteration = -2)
  </code></pre>
  
  <p>This is the error:</p>
  
  <blockquote>
    <p>Error in .h2o.doSafeREST(h2oRestApiVersion = h2oRestApiVersion,
    urlSuffix = urlSuffix,  :    Unexpected CURL error: couldn't open file
    "C:/Users/FelhasznĂˇlĂł/AppData/Local/Temp/RtmpInvPFf/file25246dec7784.csv"</p>
  </blockquote>
  
  <p>In addition: Warning message:</p>
  
  <blockquote>
    <p>In use.package("data.table") :   data.table cannot be used without R
    package bit64 version 0.9.7 or higher.  Please upgrade to take
    advantage of data.table speedups.</p>
  </blockquote>