sage.graphs.graph_list.from_graph6

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Hello,

I would like to use the method sage.graphs.graph_list.from_graph6()

However, it seems that there is some problem. For example, with this file: users.cecs.anu.edu.au/~bdm/data/chordal4.g6

I got the runtime error

RuntimeError: the string seems corrupt: valid characters are ?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstuvwxyz{|}~

However, I don't see any invalid character...

Is there something I miss? Best