Running examples in 'GGally-Ex.R' failed
The error most likely occurred in:

> ### Name: ggnet
> ### Title: ggnet - Plot a network with ggplot2
> ### Aliases: ggnet
> 
> ### ** Examples
> 
> library(network)
network: Classes for Relational Data
Version 1.13.0 created on 2015-08-31.
copyright (c) 2005, Carter T. Butts, University of California-Irvine
                    Mark S. Handcock, University of California -- Los Angeles
                    David R. Hunter, Penn State University
                    Martina Morris, University of Washington
                    Skye Bender-deMoll, University of Washington
 For citation information, type citation("network").
 Type help("network-package") to get started.

> 
> # random adjacency matrix
> x           <- 10
> ndyads      <- x * (x - 1)
> density     <- x / ndyads
> m           <- matrix(0, nrow = x, ncol = x)
> dimnames(m) <- list(letters[ 1:x ], letters[ 1:x ])
> m[ row(m) != col(m) ] <- runif(ndyads) < density
> m
  a b c d e f g h i j
a 0 1 0 0 0 0 1 0 0 0
b 0 0 0 0 1 1 1 0 0 0
c 0 0 0 0 0 0 0 0 0 0
d 0 0 0 0 0 0 0 0 0 0
e 0 0 0 0 0 0 0 0 0 0
f 0 0 0 0 0 0 0 1 0 0
g 0 0 0 0 0 0 0 0 0 0
h 0 0 0 0 0 0 0 0 0 0
i 0 0 0 0 0 0 0 0 0 0
j 0 0 1 0 0 0 0 0 0 0
> 
> # random undirected network
> n <- network::network(m, directed = FALSE)
> n
 Network attributes:
  vertices = 10 
  directed = FALSE 
  hyper = FALSE 
  loops = FALSE 
  multiple = FALSE 
  bipartite = FALSE 
  total edges= 7 
    missing edges= 0 
    non-missing edges= 7 

 Vertex attribute names: 
    vertex.names 

No edge attributes
> 
> ggnet(n, label = TRUE, alpha = 1, color = "white", segment.color = "black")
Loading required package: sna
Loading required package: statnet.common
sna: Tools for Social Network Analysis
Version 2.4 created on 2016-07-23.
copyright (c) 2005, Carter T. Butts, University of California-Irvine
 For citation information, type citation("sna").
 Type help(package="sna") to get started.

Loading required package: scales
Error: Columns `x`, `y`, `xend`, `yend` must be 1d atomic vectors or lists
Execution halted