title: Google Ortools - trouble with routing example
body: <p>I am having an odd issue with Google Ortools vehicle routing example, found here:</p>
  
  <p><a href="https://developers.google.com/optimization/routing/tsp/vehicle_routing" rel="nofollow noreferrer">https://developers.google.com/optimization/routing/tsp/vehicle_routing</a></p>
  
  <p>Using Windows 10, and Python 3.6...</p>
  
  <p>When executing the full program code provided in the link above, the program freezes up and exits. Command line provides the following:</p>
  
  <pre><code>WARNING: Logging before InitGoogleLogging() is written to STDERR
  F0502 21:33:22.115679  7972 search.cc:2658] Check failed: step &gt; 0 (0 vs. 0)
  *** Check failure stack trace: ***
  </code></pre>
  
  <p>I have honed the code causing the freeze down to this line of code:</p>
  
  <pre><code>assignment = routing.SolveWithParameters(search_parameters)
  </code></pre>
  
  <p>I am certain I have the library properly installed because other examples of the program have run successfully. I attempted to use Visual Studio, and even went so far as to disable my second GPU. </p>
  
  <p>I am wondering if anyone has encountered this issue and possibly knows how to fix. Thank You. </p>