*DirectedGraphPlugin error:*Error: /tmp/DiGraphPluginMYRawycHP2.dot: syntax error in line 5 01: Problem executing /usr/bin/dot: '/usr/bin/dot /tmp/DiGraphPluginMYRawycHP2.dot -Tpng -o/tmp/DGPPcr86QlTnu.png 2> /tmp/DiGraphPluginMYRawycHP2.dot.err ', got: 02: /usr/bin/dot exited with rc=1 03: