初次使用Rstudio，画网络图时出现了一个错误，run

network <- mtc.network(data, description="Example", treatments=treatments)

plot(network)

时，底下提示

> network <- mtc.network(data, description="Example", treatments=treatments)

Error in if (warn && !all(sel)) { : missing value where TRUE/FALSE needed

> plot(network)

Error in plot(network) : object 'network' not found

有没有大神指导一下该怎么办？