title: PyInstaller error: 'PyiModuleGraph' object has no attribute 'edgeData'
body: <p>I'm trying to create an executable from a python script using PyInstaller, but I'm getting the following error</p>
  
  <pre><code>File "/Users/cmustata/Library/Python/2.7/lib/python/site-packages/PyInstaller/lib/modulegraph/modulegraph.py", line 1225, in _updateReference
  ed = self.edgeData(fromnode, tonode)
  AttributeError: 'PyiModuleGraph' object has no attribute 'edgeData'
  </code></pre>
  
  <p>This seems to be related to PyInstaller itself and not my script, so I'm at a loss about how to fix it.</p>
  
  <p>I'm running this on <code>MacOS</code>, with <code>PyInstaller</code> installed using <code>pip</code>. Python is system installed 2.7.10</p>