Layer 4 fails when output is ~

[DigiAngel]

FYI:

Traceback (most recent call last):
  File "main.py", line 67, in <module>
    sg.draw(filename = ofn)
  File "/media/cuckoo/opt/PcapViz/pcapviz/core.py", line 198, in draw
    graph.draw(filename)
  File "/usr/local/lib/python2.7/dist-packages/pygraphviz/agraph.py", line 1518, in draw
    fh = self._get_fh(path, 'w+b')
  File "/usr/local/lib/python2.7/dist-packages/pygraphviz/agraph.py", line 1547, in _get_fh
    fh = open(path, mode=mode)
IOError: [Errno 2] No such file or directory: 'Raw_223_/home/me/bad/work/pcaps/layer4.png'

layer 2 and 3 had no issues outputing to ~/bad/work/pcaps/layer3.png