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

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: makeRiver
> ### Title: Create a new riverplot object
> ### Aliases: makeRiver
> 
> ### ** Examples
> 
> nodes <- c( LETTERS[1:3] )
> edges <- list( A= list( C= 10 ), B= list( C= 10 ) )
> r <- makeRiver( nodes, edges, node_xpos= c( 1,1,2 ),
+   node_labels= c( A= "Node A", B= "Node B", C= "Node C" ),
+   node_styles= list( A= list( col= "yellow" )) )
> plot( r )
--------------
Default style:
-----------
$nodestyle
[1] "regular"

$col
[1] "grey"

$srt
[1] "90"

$lty
[1] 1

$textcol
[1] "black"

$textcex
[1] 1

$edgecol
[1] "gradient"

$edgestyle
[1] "sin"

attr(,"class")
[1] "list"           "riverplotStyle"
--------------
[1] "checking edges"
[1] "adding mid points"
Updated styles:
$A
$col
[1] "yellow"

$nodestyle
[1] "regular"

$srt
[1] "90"

$lty
[1] 1

$textcol
[1] "black"

$textcex
[1] 1

$edgecol
[1] "gradient"

$edgestyle
[1] "sin"

attr(,"class")
[1] "list"           "riverplotStyle"

$B
$nodestyle
[1] "regular"

$col
[1] "grey"

$srt
[1] "90"

$lty
[1] 1

$textcol
[1] "black"

$textcex
[1] 1

$edgecol
[1] "gradient"

$edgestyle
[1] "sin"

attr(,"class")
[1] "list"           "riverplotStyle"

$C
$nodestyle
[1] "regular"

$col
[1] "grey"

$srt
[1] "90"

$lty
[1] 1

$textcol
[1] "black"

$textcex
[1] 1

$edgecol
[1] "gradient"

$edgestyle
[1] "sin"

attr(,"class")
[1] "list"           "riverplotStyle"

$`A->C`
$nodestyle
[1] "regular"

$col
[1] "grey"

$srt
[1] "90"

$lty
[1] 1

$textcol
[1] "black"

$textcex
[1] 1

$edgecol
[1] "gradient"

$edgestyle
[1] "sin"

attr(,"class")
[1] "list"           "riverplotStyle"

$`B->C`
$nodestyle
[1] "regular"

$col
[1] "grey"

$srt
[1] "90"

$lty
[1] 1

$textcol
[1] "black"

$textcex
[1] 1

$edgecol
[1] "gradient"

$edgestyle
[1] "sin"

attr(,"class")
[1] "list"           "riverplotStyle"

--------------
[1] "calculating sizes"
$lefts
 A  B  C 
 0  0 20 

$rights
 A  B  C 
10 10  0 

$sizey
 A  B  C 
10 10 20 

[1] "calculating positions"
[1] 2
  ID x labels
A  A 1 Node A
B  B 1 Node B
C  C 2 Node C
[1] "done"
Error in xtfrm.default(x) : cannot xtfrm 'x'
Calls: plot ... lapply -> FUN -> as.vector -> xtfrm -> xtfrm.default
Execution halted