exampleG example doesn't work

[Manslow]

I tried to run this using your 'exampleG.txt' data and I got the following exception:

Traceback (most recent call last):
File "/Users/essence/PycharmProjects/CommentScraper/CommentScraper/analysis/gSpan_test.py", line 30, in
gSpan.g_span([], graphs, min_sup=2, extensions=extensions)
File "/Users/essence/PycharmProjects/CommentScraper/CommentScraper/analysis/gSpan.py", line 678, in g_span
g_span(C_prime, D, min_sup, extensions)
File "/Users/essence/PycharmProjects/CommentScraper/CommentScraper/analysis/gSpan.py", line 678, in g_span
g_span(C_prime, D, min_sup, extensions)
File "/Users/essence/PycharmProjects/CommentScraper/CommentScraper/analysis/gSpan.py", line 678, in g_span
g_span(C_prime, D, min_sup, extensions)
File "/Users/essence/PycharmProjects/CommentScraper/CommentScraper/analysis/gSpan.py", line 668, in g_span
E = RMPE(C, D)
File "/Users/essence/PycharmProjects/CommentScraper/CommentScraper/analysis/gSpan.py", line 588, in RMPE
raise Exception('Couldn't find edge')
Exception: Couldn't find edge

I also tried to run it on my own data first and got:

AttributeError: 'Vertex' object has no attribute 'parent'