title: google colaboratory: Failed to execute cell
body: <p>Recently, I tried to use google colaboratory free GPU to try some new things. I followed <a href="https://medium.com/deep-learning-turkey/google-colab-free-gpu-tutorial-e113627b9f5d" rel="nofollow noreferrer">https://medium.com/deep-learning-turkey/google-colab-free-gpu-tutorial-e113627b9f5d</a> tutorial to set up my first code notebook.
  But after I Run these codes first in order to install the necessary libraries and perform authorization</p>
  
  <pre><code>!apt-get install -y -qq software-properties-common python-software-properties module-init-tools
  
  !add-apt-repository -y ppa:alessandro-strada/ppa 2&gt;&amp;1 &gt; /dev/null
  
  !apt-get update -qq 2&gt;&amp;1 &gt; /dev/null
  
  !apt-get -y install -qq google-drive-ocamlfuse fuse
  
  from google.colab import auth
  
  auth.authenticate_user()
  
  from oauth2client.client import GoogleCredentials
  
  creds = GoogleCredentials.get_application_default()
  
  import getpass
  
  !google-drive-ocamlfuse -headless -id={creds.client_id} -secret={creds.client_secret} &lt; /dev/null 2&gt;&amp;1 | grep URL
  
  vcode = getpass.getpass()
  
  !echo {vcode} | google-drive-ocamlfuse -headless -id={creds.client_id} -secret={creds.client_secret}
  </code></pre>
  
  <p>when I copy verification code and paste it to text box, then every things become weird. I can't run execute cell and get the following message:</p>
  
  <p><strong>Error</strong></p>
  
  <blockquote>
    <p><strong>Failed to execute cell. Could not send execute message to runtime: Error: Not connected to a runtime.</strong></p>
  </blockquote>
  
  <p>Detail:</p>
  
  <pre><code>Not connected to a runtime.
  eM@https://colab.research.google.com/v2/external/external_polymer_binary.js?vrz=colab_20180307_085323-RC00_188182835:2574:310
  
  bM/&lt;@https://colab.research.google.com/v2/external/external_polymer_binary.js?vrz=colab_20180307_085323-RC00_188182835:1903:489
  
  mg/e.child&lt;/e.onFulfilled&lt;@https://colab.research.google.com/v2/external/external_polymer_binary.js?vrz=colab_20180307_085323-RC00_188182835:640:214
  
  wg@https://colab.research.google.com/v2/external/external_polymer_binary.js?vrz=colab_20180307_085323-RC00_188182835:644:292
  
  sg@https://colab.research.google.com/v2/external/external_polymer_binary.js?vrz=colab_20180307_085323-RC00_188182835:644:164
  
  ag.prototype.executeCallbacks_@https://colab.research.google.com/v2/external/external_polymer_binary.js?vrz=colab_20180307_085323-RC00_188182835:643:359
  
  Xf@https://colab.research.google.com/v2/external/external_polymer_binary.js?vrz=colab_20180307_085323-RC00_188182835:634:564
  </code></pre>
  
  <p>I tried to reload the page or relaunch the google drive, but nothing help. Could someone help me out?</p>