[BioC] Rgraphviz- \"len\" is not a graphical parameter

[narsis [guest]]

I have installed  Rgraphvis on my computer 
(OS:Windows vista.
I have tried to make the following graph

 V <- letters[1:10]
> M <- 1:4
> set.seed(123)
> V <- letters[1:10]
> M <- 1:4
> g1 <- randomGraph(V, M, .2)
> plot(g1, "neato")

Then I got following error:
There were 32 warnings (use warnings() to see them)
>  warnings() 
Warning messages:
1: In plot.xy(xy.coords(x, y), type = type, ...) :
  "len" is not a graphical parameter
2: In plot.xy(xy.coords(x, y), type = type, ...) :
  "edgemode" is not a graphical parameter
3: In plot.xy(xy.coords(x, y), type = type, ...) :
  "len" is not a graphical parameter
4: In plot.xy(xy.coords(x, y), type = type, ...) :
  "edgemode" is not a graphical parameter
....
I have cheked Path variables for both R and Graphvis
 strsplit(Sys.getenv("PATH"), ";")
[[1]]
 [1] "C:\\Program Files\\copasi.org\\COPASI 4.8.35\\bin"               
 [2] "C:\\Program Files\\Common Files\\Microsoft Shared\\Windows Live" 
 [3] "C:\\texmf\\miktex\\bin"                                          
 [4] "C:\\Windows\\system32"                                           
 [5] "C:\\Windows"                                                     
 [6] "C:\\Windows\\System32\\Wbem"                                     
 [7] "C:\\Program Files\\Common Files\\Roxio Shared\\9.0\\DLLShared\\" 
 [8] "C:\\Program Files\\Common Files\\Roxio Shared\\DLLShared\\"      
 [9] "c:\\Program Files\\Microsoft SQL Server\\100\\Tools\\Binn\\"     
[10] "c:\\Program Files\\Microsoft SQL Server\\100\\DTS\\Binn\\"       
[11] "C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\"                
[12] "C:\\Program Files\\Windows Live\\Shared"                         
[13] "C:\\Program Files\\QuickTime\\QTSystem\\"                        
[14] "C:\\Program Files\\MATLAB\\R2010b\\runtime\\win32"               
[15] "C:\\Program Files\\MATLAB\\R2010b\\bin"                          
[16] "c:\\Program Files\\Graphviz2.20\\bin"                            
[17] "C:\\Program Files\\SSH Communications Security\\SSH Secure Shell"

and 
 list.files(strsplit(Sys.getenv("PATH"), ";")[[1]][[14]], "dll")
[1] "mclcom7_14.dll"     "mclcommain7_14.dll" "mclmcrrt7_14.dll"  
[4] "mclxlmain7_14.dll"  "msvcp60.dll"        "mwcommgr.dll"      
[7] "mwcomutil.dll"     

I do not know what is the problem , It would be appreciated if you can help me.
Best
Narsis

 -- output of sessionInfo(): 

R version 2.15.1 (2012-06-22)
Platform: i386-pc-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=English_United States.1252 
[2] LC_CTYPE=English_United States.1252   
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                          
[5] LC_TIME=English_United States.1252    

attached base packages:
[1] grid      stats     graphics  grDevices utils     datasets  methods  
[8] base     

other attached packages:
[1] Rgraphviz_1.34.2    graph_1.34.0        BiocInstaller_1.4.7

loaded via a namespace (and not attached):
[1] BiocGenerics_0.2.0 stats4_2.15.1      tools_2.15.1 

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