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Could you edit your message to include a cut-and-paste of exactly what you did and what error message it returned? It seems to work for me just like in the examples, but I'm running Sage 4.6.2 and don't know about earlier versions:
sage: X = SimplicialComplex(3, [[0,1], [1,2], [2,3], [3,0]])
sage: X
Simplicial complex with vertex set (0, 1, 2, 3) and facets {(1, 2), (2, 3), (0, 3), (0, 1)}
sage: X.h_vector()
[1, 2, 1]
