title: _pickle.UnpicklingError: invalid load key, 'x'
body: <p>I have <a href="https://www.dropbox.com/s/dpboixa1xgojzy7/bof.pkl?dl=1" rel="noreferrer">this</a> pickle file, which I'm trying to unpickle using the following Python script:</p>
  
  <pre><code>import _pickle as pickle
  
  pickle_file = open('bof.pkl', 'rb')
  data = pickle.load(pickle_file)
  </code></pre>
  
  <p>When I run the program, I get the following error:</p>
  
  <pre><code>Traceback (most recent call last):
    File "unpickle.py", line 4, in &lt;module&gt;
      data = pickle.load(pickle_file)
  _pickle.UnpicklingError: invalid load key, 'x'.
  </code></pre>
  
  <p>How can I solve this issue, as I couldn't find a way to do that.</p>