title: bert-serving-start giving error TypeError: cannot unpack non-iterable NoneType object - tried multiple paths to the model
body: <p>I am trying to use BERT with <code>bert-serving-start</code> in python3.8 but it does not initialise and throws error:</p>
  
  <pre><code>TypeError: cannot unpack non-iterable NoneType object
  </code></pre>
  
  <p>This may have something to do with the path not being recognised but I followed the instructions as follows: <a href="https://github.com/hanxiao/bert-as-service#install" rel="nofollow noreferrer">https://github.com/hanxiao/bert-as-service#install</a></p>
  
  <p>My folder is unzipped and entire model path is:</p>
  
  <pre><code>C:\Users\g\PycharmProjects\Project1\cased_L-12_H-768_A-12\cased_L-12_H-768_A-12
  </code></pre>
  
  <p>This occurs when running this in the command line as instructed.</p>
  
  <pre><code>bert-serving-start 
  -model_dir \Users\g\PycharmProjects\Project1\cased_L-12_H-768_A-12\cased_L-12_H-768_A-12 -num_worker=1
  </code></pre>
  
  <p>I don't know if this is a bug to report as it does say untested with the current Tensorflow but it may just be a mistake I made.</p>
  
  <p>Was hoping someone could double check it's not me before submitting a bug report.</p>