r - rgexf error: duplicate 'row.names' are not allowed -

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i'm trying convert igraph object gexf object r package rgexf.

i have large igraph object subset different igraph objects using subgraph.edges function in igraph. 

g<-subgraph.edges(g_large, which(e(county)$score==2))

all 1 of these subset igraph objects has been converted gexf objects. 1 subset igraph object produces following error: 

g_gexf <- igraph.to.gexf(g, position=null) error in `row.names<-.data.frame`(`*tmp*`, value = value) :   duplicate 'row.names' not allowed

what row.names error code refers to?


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