[igraph] error while run the example "Creating simple animations"

[何伟]

I'm using igraph 0.6-2 on R 2.14.1.
When I run the example "Creating simple animations" of the screenshots
page (http://igraph.sourceforge.net/screenshots2.html#10), I got this
warning message:
In graph[[9]][[4]][[name]][index] <- value :
  number of items to replace is not a multiple of replacement length

then I press enter, and I got this error message:
Error in delete.edges(g, ebc$removed.edges[seq(length = i - 1)]) :
  At iterators.c:1809 : Cannot create iterator, invalid edge id,
Invalid vertex id

Is this a relic of zero-based indexing?

Best regards
Evan.Chris.ho