Error: ggplot2 doesn't know how to deal with data of class igraph

[JianmeiZhong]

Hi, When running the regulatornetwork function,Error: ggplot2 doesn't know how to deal with data of class igraph was reported.Here are the cmds I use: > regulators=c("GATA1","GATA2") > regulatornetwork(x, regulators, 5, 2, 5, 9, 'results/regulator_networks.pdf') ggplot2 was upgraded to newest version 2.2.1 but the error still remained and was generated by g <- fortify(rgrn) i think. any suggestions to fix this?

Thanks a lot lot.