Hi,
your code does not run in a fresh R environment:
Error in getClass(Class, where = topenv(parent.frame())) :
"graphAM" is not a defined class
If you don't provide working code, it's (too) much effort to help.
There are some graph packages arround.
Which you need depends on what you want to do.
I can't decide that easily, without seeing your example running.
Ciao,
Oliver
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