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

> ### Name: bGraph
> ### Title: Create a "Branch Graph" (Simple Tree with Root and Leaves)
> ### Aliases: bGraph
> ### Keywords: graphs
> 
> ### ** Examples
> 
> require("graph") ## Using package 'graph' => plot() method (via package 'Rgraphviz'):
Loading required package: graph
Loading required package: BiocGenerics
Loading required package: parallel

Attaching package: 'BiocGenerics'

The following objects are masked from 'package:parallel':

    clusterApply, clusterApplyLB, clusterCall, clusterEvalQ,
    clusterExport, clusterMap, parApply, parCapply, parLapply,
    parLapplyLB, parRapply, parSapply, parSapplyLB

The following objects are masked from 'package:stats':

    IQR, mad, sd, var, xtabs

The following objects are masked from 'package:base':

    Filter, Find, Map, Position, Reduce, anyDuplicated, append,
    as.data.frame, cbind, colMeans, colSums, colnames, do.call,
    duplicated, eval, evalq, get, grep, grepl, intersect, is.unsorted,
    lapply, lengths, mapply, match, mget, order, paste, pmax, pmax.int,
    pmin, pmin.int, rank, rbind, rowMeans, rowSums, rownames, sapply,
    setdiff, sort, table, tapply, union, unique, unsplit, which,
    which.max, which.min

> 
> (bg7 <- bGraph(7)) # 8 nodes {Mom, D1..D7}; 7 edges
A graphNEL graph with undirected edges
Number of Nodes = 8 
Number of Edges = 7 
> plot(bg7) # draws the graph
> 
> (bgD3 <- bGraph(3, mode="directed"))
A graphNEL graph with directed edges
Number of Nodes = 4 
Number of Edges = 3 
> plot(bgD3) # directed: using arrows
> 
> (bgw2 <- bGraph(2, weights = c(10,1)))
A graphNEL graph with undirected edges
Number of Nodes = 3 
Number of Edges = 2 
> plot(bgw2) # {maybe use lwd for weights in the future?}
> if(require("Matrix"))
+   show(as(bgw2, "sparseMatrix")) # shows the weights
Loading required package: Matrix
3 x 3 sparse Matrix of class "dgCMatrix"
Error in isFALSE(suppRows) : could not find function "isFALSE"
Calls: show -> show -> printSpMatrix2
Execution halted